T**********e
发帖数: 29576 | 1 SpaceX的实用F9火箭一千米回收实验
SpaceX plans to recover stages when customers allow
BY STEPHEN CLARK
Encouraged by the soft landing of a Falcon 9 rocket's first stage in the
Atlantic Ocean after liftoff April 18, SpaceX plans a series of stage
retrieval tests over the next few months, but only on missions where the
launcher has enough leftover fuel to accomplish the complicated re-entry
maneuvers required to safely return a rocket to Earth.
SpaceX hopes the experiments will lead to returning a rocket i... 阅读全帖 |
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s***c
发帖数: 1926 | 2 https://ukdefencejournal.org.uk/hms-queen-elizabeth-encounters-propeller-
shaft-debris-issue-trials/
Aircraft carrier HMS Queen Elizabeth has picked up an item of debris around
one of her propeller shafts officials have confirmed, quashing earlier
rumours of a major malfunction.
The UK Defence Journal received information that the supercarrier had
experienced issues relating to her propeller from a source at Invergordon,
where the vessel is currently berthed and taking on fuel.
“Divers were down... 阅读全帖 |
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发帖数: 1 | 3 Autogyros Flight characteristics
Autogyros are often regarded by fixed-wing aircraft pilots as "dangerously
unstable", which is certainly true if one tries to fly an autogyro using
fixed-wing principles. Piloted properly, a autogyro is slightly safer than a
fixed-wing aircraft because it cannot stall. A "stall" does not mean an
engine-out event, it means a fixed wing aircraft is travelling too slowly
for the wings to produce lift. Since the rotor of a autogyro is always
spinning, it cannot stall... 阅读全帖 |
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r********n
发帖数: 7441 | 4 Iran Missile Milestones
http://www.iranwatch.org/wmd/wponac-missilemilestones.htm
Updated July 2011
1985: Then-speaker of the Iranian Majlis Ali Akbar Hashemi Rafsanjani leads
a high-level delegation to Libya, Syria, North Korea and China, reportedly
to acquire missiles.
1985: Iran receives its first Scud-Bs from Libya.
1987: China sells Iran "Silkworm" anti-ship cruise missiles.
1987: Iran reportedly receives approximately 100 Scud B missiles from North
Korea. Iran had allegedly agreed to finan... 阅读全帖 |
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发帖数: 1 | 6 安-24 所有事故：
1960s
1962
29 July 1962
A MAP Kiev MSZ An-24 (CCCP-46708) overran the runway at Sheremetyevo
Airport following an aborted takeoff.[1]
1965
20 March 1965
An Aeroflot An-24 (CCCP-46764) landed short of the runway at Khanty-
Mansiysk Airport, struck a snow drift and broke up, killing 43 of 47 on
board.[2]
1966
2 February 1966
A United Arab Airlines An-24 (SU-AOB) crashed at Luxor, Egypt during a
test flight.[3]
18 March 1966
United Arab Airlines Flight 749 crashed while a... 阅读全帖 |
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j**l
发帖数: 486 | 7 https://www.nasa.gov/press-release/nasa-announces-new-tipping-point-
partnerships-for-moon-and-mars-technologies
凭啥只给 SpaceX 3米， 而给了 Blue Origin 10 米？
Cryogenic Propellant Production and Management
• Blue Origin LLC of Kent, Washington, $10 million
A ground demonstration of hydrogen and oxygen liquefaction and storage,
representing rocket and spacecraft propellant that could be produced on the
Moon. The demonstration could help inform a large-scale propellant
production plant suitable fo... 阅读全帖 |
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n*******d
发帖数: 600 | 8 Select up to 5 models to compare detailed ratings and features & specs
You can add models from other types to your chart. Learn more
Brand & Model Price Ratings and Test Results
Gas single speed self-propelled mower
Price
info
overall score
info
overall score
Mulching
info
Bagging
info
Side discharging
info
Handling
info
Ease of use
info
Brand & Model Price Ratings and Test Results
********************Gas multiple speeds self-propelled mower
Price
info
overall score
info
ove... 阅读全帖 |
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r*******t
发帖数: 8550 | 9 Section 1050.7
Disorderly conduct.
No person on or in any facility or conveyance shall:
litter, dump garbage, liquids or other matter, create a nuisance, hazard or
unsanitary condition (including, but not limited to, spitting, or urinating,
except in facilities provided). Trash and other waste materials contained
in waste receptacles shall not be removed, except by persons duly authorized
by the Authority;
smoke or carry an open flame or lighted match, cigar, cigarette, pipe or
torch;
sleep or d... 阅读全帖 |
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t******t
发帖数: 15246 | 10 China is advancing its space capabilities by developing staged combustion,
an engine technology that is likely to offer greater performance for the
Long March 6 and 7, two of a family of launchers that the country will field
around the middle of the decade.
The smaller of the two, the Long March 6, may be the first to go into
service, beating the flagship third member of the family, the Long March 5
heavy launcher.
A new 18-metric-ton-thrust engine “is a high-altitude liquid oxygen and
kerosene ... 阅读全帖 |
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发帖数: 1 | 11 马斯克透露，将很快开始测试星际载人飞船系统， 推力是土星五的两倍！
Musk: Atmospheric tests of interplanetary spaceship could happen next year
March 13, 2018 Stephen Clark
Artist’s concept of the BFR spaceship deploying a satellite in orbit.
Credit: SpaceX
A team of SpaceX engineers is building a prototype of the spaceship Elon
Musk hopes will one day carry people and cargo deep into the solar system,
and it could begin low-altitude testing next year, kicking off a multi-step
test campaign before eventually going into space, the... 阅读全帖 |
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s******l
发帖数: 472 | 12 I am looking for a lawn mower which is easy to use/maintain, quiet and clean
. Seems the Electric Cordless Self Propelled Mower is the right type for me.
my lawn is about 0.27 acer and has slopes in the front and back yards. two
brands I found in HD.
Ryobi 20 in. Self-Propelled Cordless Electric Mower
Greenworks 18 in. Electric Cordless Self Propelled Mower
wondering if the Electric Cordless Self Propelled Mower the right choice for
me? any suggestion to the brand?
Thanks a bunch! |
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c**i
发帖数: 6973 | 16 You wake up too late. A half-century late.
(1) In the first Gulf War
http://en.wikipedia.org/wiki/Gulf_War
, convoys of tanks and armored personnel carriers were destroyed by US, with
new bombs.
Soldiers in the first several tanks of a convoy died instantly. But soldiers
in the following tanks jumped out and escaped.
(a) I am referring to
Lockheed Martin CBU-97/B
http://www.designation-systems.net/dusrm/app5/wcmd.html
CBU and BLU stand for Cluster Bomb Unit and Bomb Live Unit, respectively.
(b) ... 阅读全帖 |
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c**i
发帖数: 6973 | 17 (1) Faster helicopters | Racing Rotors; Chop, chop. Economist, May 19, 2011
http://www.economist.com/node/18710100
Note:
(a) The ar5ticle says, "As the aircraft accelerates, the airspeed of a blade
(and thus the amount of lift it provides) increases when that blade is
moving forwards and decreases when it is moving backwards. Eventually, the
imbalance becomes unsustainable."
This is called "dissymmetry of lift."
Please
(i) BROWSE
helicopter
http://en.wikipedia.org/wiki/Helicopter#Limitations
(se... 阅读全帖 |
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c**i
发帖数: 6973 | 18 I am a biologist by training. But it appears you are as ignorant about
rockets as I.
(1) Tiangong 1 weighs merely 8.5 metric tons (hereafter tonnes). Besides
Tiangong 1 on Sept 29, 2011 Long March 2F also launched Shenzhou 5 (in 2003)
, 6 and 7, all into low Earth orbit (LEO), which is defined as "from the
Earth’s surface up to an altitude of 2,000 km."
http://en.wikipedia.org/wiki/Low_Earth_orbit
In comparison:
Geostationary transfer orbit
http://en.wikipedia.org/wiki/Geostationary_transfer_orb... 阅读全帖 |
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S****o
发帖数: 503 | 19 那个16吨是包括燃料的总质量，燃料质量超过10吨。燃料也不是液氢液氧。
下面是wiki上的数据：
Ascent stage
Mass including fuel: 10,300 lb (4,700 kg)
RCS propellant mass: 633 lb (287 kg)
APS propellant mass: 5,187 lb (2,353 kg)
Descent stage
Mass including fuel: 22,783 lb (10,334 kg)
DPS propellant mass: 18,000 lb (8,200 kg) |
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T**********e
发帖数: 29576 | 20
毛子的火箭太老了，近年没啥发展。据说以前毛子造的火箭发动机零件够用好些年的现
在都拿出来卖，老车虽然保养好还能开，和新车没法比啊。
The first stage uses RP-1 (kerosene) and liquid oxygen (LOX) as propellants,
powering two Aerojet AJ-26 engines, which are modified Soviet-built NK-33
engines. Together they produce 3,265 kilonewtons (734,000 lbf) of thrust at
sea level and 3,630 kN (816,100 lbf) in vacuum. As Orbital has little
experience with large liquid stages and LOX propellant, some of the Antares
first stage work was contracted to the Ukrainian Yuzhnoye SD... 阅读全帖 |
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发帖数: 1 | 21 Naval History and Heritage Command
Naval History and Heritage Command
Open for Print Social Media
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DANFS » S » South Dakota I (Armored Cruiser No. 9)
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South Dakota I (Armored Cruiser No. 9)
1902... 阅读全帖 |
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M***s
发帖数: 8769 | 22 本田汽车公司2日宣布，将在美国召回大约27．3万辆汽车，原因是驾驶座气囊有缺陷，
需要更换气囊的充气装置。
根据本田当天发布的声明，本次召回的车辆主要包括2001－2003年度的本田和Acura品
牌的汽车。本田说，驾驶座气囊充气气罐可能在事故中破裂，散射出碎片，从而造成人
员伤亡。
本田说，收到通知的车主应尽快将汽车送到授权经销商处进行修理。
同一天，丰田汽车公司宣布在美国召回21万辆塞纳汽车，因为这款车未能正确标示车辆
最大载重量。
Honda Recalls 273,000 Vehicles for Potentially Deadly Airbag Defect
2 deaths, 18 injuries are attributed to a faulty airbag inflator.
By Exhaust Notes Dec 2, 2011 8:38AM
The 2002 Honda Civic. (Photo by Honda.)Honda is recalling 273,000 Honda and
Acura vehicles to address an airb... 阅读全帖 |
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X***9
发帖数: 7385 | 23
15年前发表的，如果有问题早被喜欢賺本田钱的律师告了
Honda S2000 -- Transmission
9/15/2000 4:18:21 PM
6-SPEED MANUAL TRANSMISSION
OVERVIEW
Honda engineers designed an entirely new close-ratio, 6-speed manual
transmission for the S2000. A limited-slip differential was chosen to ensure
continuous application of power to the rear wheels, especially when
cornering. The transmission and entire drivetrain are designed to be highly
rigid and as compact and lightweight as possible, making the vehicle more
responsive to driver i... 阅读全帖 |
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h******x
发帖数: 10156 | 24 from blackfday.com
http://www.blackfday.com/blackfday-sears.pdf
2-pk. Auto Travel Bottles $6.99
Amor All Gift Kit $11.99
Brake Service (must present coupon from ad) 15% off
Cobra 9-Band Radar Detector w/ Laser Eye $29.99 EB
Comfort Cushion $15.99
Craftsman Digital Air Gauge $14.99
DieHard 12-ft. Booster Cable $14.99
DieHard Battery Charger $39.99
DieHard Battery Charger/Maintainer $19.99
DieHard Dual-rate Battery Charger $29.99
DieHard Portable Power 750 $39.99
DieHard Wheeled Battery Charger / ... 阅读全帖 |
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k*****c
发帖数: 1670 | 25 我的剪草机不工作了。
型号：toro High Wheel Variable Speed Self-Propelled Gas Mower - 20371
周末剪草到一半时，剪草机不工作了，发现是汽油没有了。
加满了汽油，再拉绳打火，可以打着，但是，一拉那个横杆，self-Propelled,1-2秒后
就会停止工作。
再次拉绳打火，可以打着，但是，engine的速度比正常的时候要慢，而且，一试图self
-Propelled，就死火。
而且，刚刚过了一年的保修期。
谁帮着分析一些，到底会是什么问题啊？ |
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z****e
发帖数: 555 | 26 Closing is on Aug 29. Hope I can close it on time.
I am in ma. How long do I still need to mow the lawn? it is 0.51 ace.
The house is on a small hill. Not that steep but still ...
I used self-propelled mower before. The biggest problem for me is that I am
not strong enough to pull the string to start it. It is heavy when we put a
bag on it.
I am not sure what I will do for the rest of the year.I wonder if I should
buy a self-propelled mower and give it a try. Or I have to hire someone to
do it f... 阅读全帖 |
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S*A
发帖数: 7142 | 27
Honda mower 有 easy pull，一拉一定启动。你的 presure washer
不一定有。
这个我和 dealer 聊过，通常那种损坏是由于开着 self propel 比较使劲
撞到前面的柱子墙之类。 Honda 的 self propel 是用齿轮的，
有不同的速度控制 cruise control 等等。 mower 不是碰碰车，看到
前面有东西就减速慢点过好了。我的 HRX 已经 3，4 年了，完全没有问题。
如果你喜欢 head on 撞硬的东西的话，那种单速的 self propel 会比
较皮实。 |
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b*****i
发帖数: 770 | 28 整个lot大概0.2 acre多点，去掉房子和driveway,需要割草的面积最多0.15 acre。因
为是walkout basement,房子的两侧有点坡，但前后院都很平.我们倾向于买个电动的割
草机，因为不喜欢gas mower的噪音、汽油味、还有维护。但是我们不太确定电动的割
草机是不是适合我们家的院子。有些问题请教大家：
1。充电的割草机和corded的割草机能不能handle这样大小的草地？
2。在坡上割草，充电的和电线的相比，哪个更轻松（充电的一般重些，但某些型号有
self-propelled的功能，虽然我怀疑电池不一定能带动self propel；电线的一般都没
有self-propelled的功能，坡上完全靠自己推）？或者两个都很痛苦？
谢谢！ |
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w**s
发帖数: 1911 | 30 我用的是home depot的ego的割草机，56v，7.5ah的，就是比以前用的gas的还有力，也
是self propelled的。很长的草在斜坡上都没有问题。不相信我，你到homedepot网站
看几千个reviews。一定要买self propelled的
据说greenworks 80v，5ah的更好，更有劲，是brushless的，也是self propelled的。
但是保修店太少，我没有买它家的
你对4ah的理解是错误的，那个只是容量。greenworks的80v的电池，2ah跟4ah是可以互
相换的，2ah用的时间是4ah的一半。电流多少真不知道，但80v的2ah跟4ah电流肯定是
一样的。
要有好奇心，有玩的心态。这些割草机还没有一个手机贵。许多人自己割草，不是因为
请不起割草的 |
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h******x
发帖数: 10156 | 31 【 以下文字转载自 ebiz 讨论区 】
发信人: happylux (mike), 信区: ebiz
标 题: Sears Black Friday 2010 ad
发信站: BBS 未名空间站 (Mon Nov 8 07:51:06 2010, 美东)
from blackfday.com
http://www.blackfday.com/blackfday-sears.pdf
2-pk. Auto Travel Bottles $6.99
Amor All Gift Kit $11.99
Brake Service (must present coupon from ad) 15% off
Cobra 9-Band Radar Detector w/ Laser Eye $29.99 EB
Comfort Cushion $15.99
Craftsman Digital Air Gauge $14.99
DieHard 12-ft. Booster Cable $14.99
DieHard Battery Charger $39.99
DieHard Battery Char... 阅读全帖 |
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D*****a
发帖数: 810 | 32 Buy (2) Tena liners 26 ct - B1G1 50% off @ $3.99
total = 5.98
Use (2) $2/1 TENA Product printable
Pay $1.98, get $4 ECB (limit 1)
Final price: $2.02 money maker
Propel electrolyte water 25.4 oz - $1.25
Pay $1.25, get $1.25 ECB
Submit for $0.75 Propel 500mL+ Ibotta deposit
Final price: $0.75 money maker
Buy (2) Gatorade 20 oz  or lipton sparkling ice tea 12 oz - $1
Pay $2, get $2 ECB
Final price: Free
Colgate Total Toothpaste 4 oz – $3
Use $1/1 Colgate Total, Colgate Optic White, Colgate... 阅读全帖 |
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s**********g
发帖数: 14942 | 33 就是self propelled吧？启动后自己往前跑的？
如果是self propelled的机器，不启动self propelled当然累了。。。死沉的呢
但我同事说的是push mower，虽然不能自己往前跑，但本体足够轻 |
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e***s
发帖数: 1397 | 34 Summary: Best choice is 12GA pump shotgun, loaded with #1 buckshot.
http://www.firearmstactical.com/briefs10.htm
Shotgun Home Defense Ammunition
(Tactical Briefs #10, October 1998)
For home defense, a shotgun is superior to a handgun in terms of being able
to stop a violent intruder as quickly as possible. A reliable, well-made,
pump-action shotgun can usually be purchased for less than the cost of a
handgun of comparable quality. Also, inexpensive birdshot ammunition,
typically used for trainin... 阅读全帖 |
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b*****e
发帖数: 1264 | 35 http://www.mercedsunstar.com/106/story/552540.html
Flight school student dies in accident at Castle Airport
26-year-old killed by propeller; deputy says death followed uncertified two-
person flight
By VICTOR A. PATTON
v*****[email protected]
A 26-year-old flight student is dead after a propeller accident Saturday on
the runway of Castle Airport.
Merced County sheriff's spokesman Tom MacKenzie said the Sierra Academy of
Aeronautics student, a Chinese national, was killed when the propeller of |
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b*****e
发帖数: 1264 | 36 http://www.mercedsunstar.com/106/story/552540.html
Flight school student dies in accident at Castle Airport
26-year-old killed by propeller; deputy says death followed uncertified two-
person flight
By VICTOR A. PATTON
v*****[email protected]
A 26-year-old flight student is dead after a propeller accident Saturday on
the runway of Castle Airport.
Merced County sheriff's spokesman Tom MacKenzie said the Sierra Academy of
Aeronautics student, a Chinese national, was killed when the propeller of |
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c**i
发帖数: 6973 | 39 Harpoon is A/R/UGM-84.
AGM stands for air-to-ground missile; RGM Radar Guided Missile; UGM
Underwater Guided Missile.
(1) Harpoon Block II; Backgrounder. Boeing, undated.
http://www.boeing.com/defense-space
/missiles/harpoon/docs/HarpoonBlockIIBackgrounder.pdf
Quote:
"Weight:
1,160 lb. Air configuration
1,459 lb. ASROC configuration
1,520 lb. TARTAR configuration
1,523 lb. Capsule/canister configuration
"Propulsion: Air-breathing turbojet engine (cruise), solid-propellant
booster
Note:
(a) RUR-5... 阅读全帖 |
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m********6
发帖数: 1283 | 41 http://www.asianage.com/india/agni-v-indias-china-killer-306
Agni-V, India's 'China Killer'
India on Thursday successfully launched its long-range Agni-V ballistic
missile.
Here are some salient features of the missile and the test, which propelled
the country into a special league of nations:
* Agni-V is a 5,000-km intermediate range ballistic missile (IRBM)
* Short of an inter-continental ballistic missile (ICBM) by 500 km
* 17.5 metres long, can carry 1- to 1.5-tonne conventional and nuclear ... 阅读全帖 |
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u***r
发帖数: 4825 | 42 http://www.economist.com/news/leaders/21582256-emerging-market-
The emerging-market slowdown is not the beginning of a bust. But it is a
turning-point for the world economy
Jul 27th 2013 |From the print edition
WHEN a champion sprinter falls short of his best speeds, it takes a while to
determine whether he is temporarily on poor form or has permanently lost
his edge. The same is true with emerging markets, the world economy’s 21st-
century sprinters. After a decade of surging growth, in which t... 阅读全帖 |
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m**********2
发帖数: 6568 | 43 老秋，你又重新发明了一次轮子。
Rocket mine
A Russian invention, the rocket mine is a bottom distance mine that fires a
homing high-speed rocket (not torpedo) upwards towards the target. It is
intended to allow a bottom mine to attack surface ships as well as
submarines from a greater depth. One type is the Te-1 rocket propelled mine.
The torpedo mine is a self-propelled variety, able to lie in wait for a
target and then pursue it e.g. the Mark 60 CAPTOR. Other designs such as the
Mk 67 Submarine Launched Mobil... 阅读全帖 |
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b********n
发帖数: 38600 | 44 你小时候跳过芭蕾， 给说说 2：14 的动作叫什么？
•Arabesque: The body with one leg extended behind it, with a straight
knee
•Assemblé: The working leg slides along the floor before kicking into
the air, and the standing leg propels the body into a jump. The two feet
are 'assembled' in fifth position before landing on the floor.
•Attitude: One leg extended behind the body, with the knee bent at a
90 degree angle
•Balancé: A three-step that resembles a waltz, the leading foot steps
out and weigh... 阅读全帖 |
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T*****y
发帖数: 18592 | 45 Witnesses said the gunmen in Simferopol, the Crimean regional capital, wore
unmarked camouflage uniforms and carried rocket-propelled grenades, sniper
rifles and other weapons. They raised the Russian flag over the local
parliament building.
The men did not immediately voice any demands and threw a flash grenade in
response to a journalist's questions. They wore black and orange ribbons, a
Russian symbol of the victory in World War II, and put up a sign reading "
Crimea is Russia."
Maxim, a pro-... 阅读全帖 |
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S***1
发帖数: 3140 | 46 一次航程1.5万公里，时速60公里，可以从印度洋开到大西洋再回到太平洋。排水量
7200吨，载有16枚射程达295公里的“布拉莫"超音速巡航导弹。
Indian warship building is coming of age and the Indo-Pacific region knows
it. Last week, when an Indian Navy frigate, INS Shivalik, visited China’s
Qingdao naval base, China’s navy chief, Admiral Wu Shengli, asked the
captain for a tour of the Combat Information Centre, the operation heart of
the warship. The Shivalik’s young skipper, Captain Puruvir Das, turned down
Wu’s request.
The Chinese admiral would be even more in... 阅读全帖 |
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b********n
发帖数: 38600 | 47 Top 10 movies:
1.
http://us.imdb.com/title/tt0073488/
Oni srazhalis za rodinu (1975)
("They fought for the Motherland") - One of best Soviet military movies,
very many best Soviet famous actors played in this movie. As I remember,
this movie got "Oscar" in USA. Summer of 1942... Remainders of broken
regiment are retreating in Don region. Their regiment lost most part of men,
they fought and retreat very long time but they do not run, they retreat in
order and continue to fight when command order... 阅读全帖 |
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T**********e
发帖数: 29576 | 48
自己家的，9-11以后难道没被fbi监控。
In late 2001, Tom Mueller was sacrificing his nights and weekends to build a
liquid-fuel rocket engine in his garage.
Mueller, a propulsion engineer at Redondo Beach, Calif.–based aerospace
firm TRW, felt like an “unwanted necessity” at his day job. His prolific
ideas about engine design were lost at such a large, diverse company. To
satisfy his creative impulses, he built his own engines, attached them to
airframes and launched them in the Mojave Desert with fellow enthus... 阅读全帖 |
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K***s
发帖数: 621 | 49 120辆军用车吧,坦克只是少数
1 Challenger Bottle tank
8 Abbot self-propelled gun
7 Russian 251 self-propelled guns
25 432 armoured personnel carriers
4 434 Reme repair vehicles
15 Alvis stalwarts
1 Stormer CVRT
2 CVRT Shielders
2 Russian VDRMs
1 Cech Prada anti-aircraft carrier
1 Alvis Saracen
5 Ferret armoured cars
5 Leyland DAF army lorries
1 Fox armoured car
4 Springer All-Terrain Vehicles
7 Lynx snow vehicles
2 Haglund snow cats
5 Lance nuclear missile carriers
7 Combat Engineer Vehicles
2 Supercats
10 m... 阅读全帖 |
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发帖数: 9102 | 50 Highlight 1: Heroic and Model Troops will be reviewed for the first time.
Eight Highlights in China's V-Day Military Parade
(Source: China Military Online) 2015-08-14
BEIJING, August 13 (ChinaMil) -- September 3, 2015 is China's first
Victory Day of the Chinese People's War of Resistance against Japanese
Aggression.
On that day, the celebration of the 70th anniversary of victory of
Chinese People's War of Resistance against Japanese Aggression and the World
Anti-Fascist War will be staged at t... 阅读全帖 |
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