w**h
发帖数: 1121 | 1 40分钟可能比较接近F22超音速巡航的极限。
下面这个网页估算了一下F-22超音速巡航的战斗半径，估算结果是
超音速巡航可以30分钟。各位大侠看一下，看看里面是否有什么问题。
http://lantinian.blogspot.com/2009/01/f-22-supercruise-combat-radius.html
F-22 Supercruise combat radius
Ok, the link at the end of this post seams to give some good numbers
for the F119 engines.
I would like to apply some common sence maths here to get the max pure
supercruise radius of the F-22. If anyone has better data and/or math
skills, please feel free to enlighten me.
So I accept the trust levels of t |
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k**0
发帖数: 19737 | 2 还是看看Combat radius再说吧，
F-16C:
1. Empty weight: 8,372~8,710 kg
2. Internal fuel: 3,160 kg
3. Thrust of engine: 23,770 Ib~29,000Ib class
4. Combat radius: 740 nm (with 2,000 Ib bomb*2 + AIM-9L*2 + 1,040 Gal
external fuel)
--> The total fuel of F-16C in this condition is 3,160 + 1,040*3.785*0.8 =
6,309 kg.
======================================================
F-35A:
1. Empty weight: 12,000~12,500 kg
2. Internal fuel: 8,390 kg
3. Thrust of engine: 40,000~43,000 Ib class
4. Combat radius: 600~700 nm ... 阅读全帖 |
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k**0
发帖数: 19737 | 3 就用你的数据来算的话也差不多是一样，
就算F-16 Combat radius 600nmi,
F-35 Combat radius： （from wiki)
F-35A 584 nmi
F-35B 469 nmi
F-35C 615 nmi
怎么比F35的航程都不算长吧。
即使F35不短腿,也不长就是了。而且F35的radius还有很多值得加减的地方，反正大量
服役了再看吧。 |
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J********i
发帖数: 50662 | 4 【 以下文字转载自 bagua 讨论区 】
发信人: JianlianYi (Air Yi), 信区: bagua
标 题: Japan's nuclear crisis: A timeline of key events(zz)
发信站: BBS 未名空间站 (Tue Mar 15 15:09:22 2011, 美东)
Friday's 9.0 earthquake triggered a 30-foot tsunami that damaged several
nuclear reactors in northeastern Japan, causing the country's worst crisis
since World War II.
Day 1 – Friday, March 11
* At 2:47 p.m. local time, Japan is struck by the largest recorded
earthquake in its history off the coast of the northeastern city of Senda... 阅读全帖 |
|
T******g
发帖数: 21328 | 5 大部分前驱车都比full size crew cab pickup短很多啦，大车用前驱操纵很差的
Ford Fusion
Turning Radius 18.8 '
Ford Expedition
Turning Radius 20.4 '
Ford F150 SuperCrew
Turning Radius 47.0 ' |
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c**********e
发帖数: 2007 | 6 For programming purpose, let us decide the circle's center C,
radius r, and radius vector.
Look at the triangle PP_1P_2, where P is any point on the target
circle. The 3sides are
a = l_1
b = l_2
c = |P_1-P_2|, where |.| means distance
denote s=(a+b+c)/2.
Then the area of triangle: ea=sqrt(s*(s-a)*(s-b)*(s-c)).
The height of the triangle is the radius of the circle:
r = h = 2*area/c
The distance d=|P_1-O|=sqrt(l_1^2-r^2).
So C = P_1 + P_1 + d*(P_2-P_1)/|P_2-P_1|
So P = C + r*v1 where v is any uni |
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I*******g
发帖数: 7600 | 7 【 以下文字转载自 Military 讨论区 】
发信人: beijingren (to thine own self be true), 信区: Military
标 题: 加州水不能喝了：30亿加仑毒水灌进地下水库
发信站: BBS 未名空间站 (Mon Nov 17 20:04:47 2014, 美东)
Waste Water from Oil Fracking Injected into Clean Aquifers
http://www.nbcbayarea.com/investigations/Waste-Water-from-Oil-F
"They lie, cheat, and steal without rest."
State officials allowed oil and gas companies to pump nearly three billion
gallons of waste water into underground aquifers that could have been used
for drinking water or irrig... 阅读全帖 |
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s*******e
发帖数: 131 | 8 很多朋友在二手房市场中灰头土脸以后可能会考虑新房，很多买家可能没有很好的渠道
能够及时获得新房的发售信息。最近刚好整理了一下，目前还在开盘的主要房源信息。
信息仅限南湾，有兴趣的话也有东湾版本的。
1.位于Milpitas：D.R.Horton开发的Traditions和Contempo小区
近邻大型购物中心Great Mall和Cisco等众多高科技公司，附近正在兴建的全新BART车
站即将投入使用，到达东湾和南湾都很便利。这里不仅交通方便，生活设施也很齐全，
附近遍布很多中国超市和餐馆。校区属于中上等，是自住与出租两相宜的选择。这里现
有联排别墅（Townhouse）刚刚开始出售。二到三房，房屋面积1,442到2,134平方英尺
不等，售价在79万到115万美元之间。
湾区新房开发商D.R.Horton开发的Traditions和Contempo小区。
2.位于Milpitas：KHovnanian开发的Traverse小区
同样位于大型购物中心Great Mall附近，拥有同上述Traditions小区一样的交通便利和
生活设施齐全的优点。这个小区面积很大，共有200户左右的联排... 阅读全帖 |
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f********t
发帖数: 4574 | 9 这里讲的不错。
http://www.longrangehunting.com/forums/f18/parallax-adjustment-
LouBoyd LouBoyd is offline
Silver Member
Join Date: Oct 2007
Location: Patagonia Mountains, Arizona
Posts: 448
Re: Parallax Adjustment on Scope
Lets put some numbers on it . Any non AO scope will be focused at some fixed
distance. That distance is chosen by the manufacturer, but is typically 100
to 200 yards, maybe 50 yards for 22 and handgun scopes. How much error can
it cause? if your eye is at the edge of the ex... 阅读全帖 |
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J********i
发帖数: 50662 | 10 【 以下文字转载自 bagua 讨论区 】
发信人: JianlianYi (Air Yi), 信区: bagua
标 题: Japan's nuclear crisis: A timeline of key events(zz)
发信站: BBS 未名空间站 (Tue Mar 15 15:09:22 2011, 美东)
Friday's 9.0 earthquake triggered a 30-foot tsunami that damaged several
nuclear reactors in northeastern Japan, causing the country's worst crisis
since World War II.
Day 1 – Friday, March 11
* At 2:47 p.m. local time, Japan is struck by the largest recorded
earthquake in its history off the coast of the northeastern city of Senda... 阅读全帖 |
|
B*N
发帖数: 147 | 11 i'm no expert, but here's something from Harald Harb's PMTS:
control your speed by carving with a shortened radius, by
1. placing most of your body weight on outside ski such that the ski arcs
under pressure, and
2. tipping your skis to a higher angle.
it's said that pressure and ski angle are interchangeable in terms of
shortening the radius. as long as the
radius is shortened enough, you can carve with great ski grip and speed
control.
but of course it's not easy to achieve a high angle, and t... 阅读全帖 |
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s*******r
发帖数: 1285 | 12 BreadPaPa - That is not what I meant. I mean that AC50 is not designed for
mogul skiing, but you still can use it to ski mogul runs. Bump skiing is
the hardest skill to master within a resort's boundary. It really depends
on the snow condition and the shape of bumps.
That was my thought about getting a pair of all-it-can-do skis. But I
realized that it was not possible when I used my AC50 in the west's deep
powder and in the east's icy big mogul. I'll still bring my AC50 to the
west though ... 阅读全帖 |
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r********7
发帖数: 229 | 13 第一个雪季就这样，你这是天才呀。
根据onedge前辈的帖子 （http://www.mitbbs.com/article/Ski/31232877_3.html），你这short radius turn已经很好了.特别是远看很好。你滑近镜头的时候好像有些懈怠了，动作稍微有些变形。特别是点杖，已经乱了节奏。我个人感觉short radius节奏很重要的。不过你形态很好了。再熟悉熟悉肯定没问题。
另外友情提醒下，我个人觉得你滑的这种short radius turn对雪况要求很高，太icy没
法edge,太power/crud/slush没法release edge。所以下次如果你使不出这招了别灰心
，等雪好的时候再练：）good luck~ |
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S********t
发帖数: 3431 | 14 pure carving的定义就是track exactly match the shape of ski sidecut
but pure carving doesn't necessarily demonstrate good skiing. You can "
purely carve" on a gentle slope with little turning and fairly low edging
angle, but that doesn't mean good skiing.
good skiing = ability to ski smoothly with any radius/rhythm in great
control, on any terrain any condition
going fast with little & slow turning (i.e., very long radius turn) is not
something worth showing-off. many/most skiers can do it, coz it's e... 阅读全帖 |
|
发帖数: 1 | 15 last night killed several red skull monsters and mini-boss for quests.
found out some really WS lockman style to take down over leveled monsters.
all these no require any potions, gear build, etc, just plain WS liu.
for simple starter, the regular monsters has a patrol radius.
even they aggro you and chase you, as soon as you walk away from the radius,
they will turn back.
so run in and aggro, toss few hits or Igni, then run out of the radius. back
and forth until taking down all the HP.
for man... 阅读全帖 |
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J********i
发帖数: 50662 | 16 Friday's 9.0 earthquake triggered a 30-foot tsunami that damaged several
nuclear reactors in northeastern Japan, causing the country's worst crisis
since World War II.
Day 1 – Friday, March 11
* At 2:47 p.m. local time, Japan is struck by the largest recorded
earthquake in its history off the coast of the northeastern city of Sendai.
Meteorologists log it at 8.9 on the Richter scale.
* 11 nuclear reactors shut down automatically.
* A powerful tsunami triggered by the earthquake sweep... 阅读全帖 |
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p*****s
发帖数: 1780 | 17 盆多大，坑多大。 我们这边苗圃说的
http://www.excaliburfruittrees.com/instructions.html
Planting Instructions
Dig hole exactly the size of the container.
Do not add anything to the planting hole, e.g. potting soil, fertilizer,
manure. The fertilizer and manure can burn the new roots and damage the
tree.
Place tree without the container in the hole, with the base of the trunk
1-2" above the ground for a 3-7gal and 3-4" for 15gal+. The potting soil
that the tree came in will break down and the tree wil... 阅读全帖 |
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x****o
发帖数: 21566 | 18 The following is the 500-mile email story in the form it originally appeared
, in a post to sage-members on Sun, 24 Nov 2002.:
From [email protected]
/* */ Fri Nov 29 18:00:49 2002
Date: Sun, 24 Nov 2002 21:03:02 -0500 (EST)
From: Trey Harris <[email protected]
/* */>
To: [email protected]
/* */
Subject: The case of the 500-mile email (was RE: [SAGE] Favorite impossible
task?)
Here's a problem that *sounded* impossible... I almost regret posting the
story to a wide audienc... 阅读全帖 |
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P******l
发帖数: 1648 | 19 Is this true?
"现代地震学家发现，在靠近地核的地方，确实有巨大的低温岩石板块。如果这些板块的
沉降经历了亿万年，那么它应当早已热了起来。"
----------------------------------------------
earth
solid inner core radius 1,220 km
liquid outer core extends to a radius of 3,400 km
Earth/Radius 6,371 km
mantle is from 3,400 km to 6,371 km
http://phys.org/news/2015-12-temperature-kilometers-surface-earth-varied.html
regional variations in the lower mantle where it meets the core, which are
up to three times greater than expected,
3,000 kilometres below... 阅读全帖 |
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c****r
发帖数: 185 | 20 Range query:
For each MBR (minimum bounding box), you can compute the minimum and maximum
distance from a given point P.
1. If max_distance <= P.radius, then all points inside MBR are answers
2. If min_distance > P.radius, then the MBR can be pruned
3. If min < P.radius <= max, then trace down to sub-MBRs.
Do this recursively then you can get all answers of a given point, O(logN).
Do it for every point, O(NlogN)
, |
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O*******d
发帖数: 20343 | 21 The solution, if exists, is a circle in 3D space with radius ranging from 0
to min(L1, L2). A circle in 3D space can have a center (x,y,z), a radius
and an orientation normal vector. The orientation vector is the line (P1,
P2) normalized, the center must be on the line (P1, P2). You need to do
some simple 2D trigonometry calculation to figure out the radius and
position of the center. |
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E*******r
发帖数: 370 | 22 DLS理论上可以测2nm的hydrodynamic radius,大概思路就是通过correlation function
得到diffusion coefficient D,再通过Stokes-Einstein公式从D得到hydrodynamic
radius。
关键看你想测什么，hydrodynamic radius什么的一般没问题。 |
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a*********3
发帖数: 660 | 23 定义 definition变量 variable面积 area直径 diameter半径 radius公式 formula
单价 unit price范围 range/scope/extent集合 set法则 principle本金 principal利
率 interest rate利息 interest单利 simple interest复利 compound interest正数
positive number负数 negative number解析式 analytic expression分类讨论
classified discussion性质 nature （不是很确定）奇函数 odd function偶函数
even function对称 symmetric坐标原点 origin单调性 monotonicity（不是很确定）
任意 random周期性 periodic 有界性 boundedness 数学 mathematics, maths(BrE)
, math(AmE) 公理 axiom 定理 theorem 计算 calculation 运算 operat... 阅读全帖 |
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I**b
发帖数: 12 | 24 Try these:
2> A 4-year-old girl is brought to the emergency department by her mother
because of severe wrist pain. The girl was playing with her friends in her
backyard and fell, breaking the fall with her outstretched hand. On physical
examination there is slight swelling over the dorsal aspect of the wrist. X
-ray films of the wrist are shown.
The findings are most consistent with which of the following?
A) Carpal navicular fracture
B) Cortical fracture of the radius
C) Fracture of the distal ... 阅读全帖 |
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c******n
发帖数: 380 | 25
circular pond
(it’s
for the
If so,
yes,it's possible.
Let the duck do circular motion with radius range from r/4 to (4-
pi)r/4,the fox can only do circular motion with radius r,so the duck has
faster angular velocity than fox.When the angle difference between them
reach 540/pi to 180 (depends on the radius duck chose),duck can go
straight to the nearest edge of the pond and fly away safely.
Although I seriously doubt this deficient duck can go straight right
after so many circular motion,it is |
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f********k
发帖数: 136 | 26 If we simply assume the center of the coin will be located within the
chessboard, The center of the coin will be uniformly distributed on a 8*8
square. The coin will touch one of the corners only if the distance between
the center of the coin and the corner is less than the radius of the coin,
which form 4 quarter circles with radius r on the four corners. The areas of
these 4 quarter circles simply sum to pi*r^2. So the probability will be pi
*r^2/64, where r is the radius of coin.
However, if ... 阅读全帖 |
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l**n
发帖数: 67 | 27 actually, the arguement is quite simple.
for a given particle of mass M, there is
always a compton wavelengh associated with
it, R_c = hbar/Mc. for an electron, we donot
know the radius of it, but we know its R_c
is about 100fm, which means that it's meaning-
less even to locate the position within this
distance.
for a given particle of mass M, we can relate
another length with it, the Schwarzschild
radius, R_s = 2GM/c^2. This is the critical
radius for a black hole(BH) of mass M.
in order to ma |
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S*********g
发帖数: 5298 | 28 For minimum nn distance case, we can think the ball has radius x/2.
Then, we have 1-(n-1)x spare space(The two balls on the two ends
can only count one half each). Therefore, the problem becomes
putting n balls of radius 0 into 1-(n-1)x with at least 2 balls on the
same position, this gives the probability
p(x)=n(n-1)(1-(n-1)x)^(n-1)
For the nn distance case, we can think one ball is stick to another
one by a stick of length x. Therefore,the problem becomes putting
(n-1) balls of zero radius int |
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d*******o
发帖数: 493 | 29 丫丫付包子最及时了，求长期包养。
library(gridBase)
library(lattice)
panel.piechart <-
function(x, y, labels = as.character(y),
edges = 200, radius = 0.8, clockwise = FALSE,
init.angle = if(clockwise) 90 else 0,
density = NULL, angle = 45,
col = superpose.polygon$col,
border = superpose.polygon$border,
lty = superpose.polygon$lty, ...)
{
stopifnot(require("gridBase"))
superpose.polygon <- trellis.par.get("superpose.polygon"... 阅读全帖 |
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k*****e
发帖数: 22013 | 30 radius越小，表示锐化操作影响范围小，作用越轻柔，不aggressive。
比如原图比较糊，边界模糊地带是2个像素左右，
你的radius设成0.5像素，那么基本看不出有什么作用，糊的还是糊。
如果你原图的线条模糊范围是0.5像素，
你把radius设成2个像素，那么会出现过度锐化造成的反白/反黑的硬边。 |
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m*****a
发帖数: 92 | 31 Japan Nuclear Crisis: What Is a Full Meltdown?
Tuesday March 15, 2011 2:50 PM - Leave a Comment
Japan is on the brink of a nuclear disaster in the wake of its
devastating earthquake and tsunami, with a third explosion at the
Fukushima Daiichi nuclear power station damaging the steel containment
structure of one reactor, and a fire at another spewing radioactive
material into the air. Before the latest explosion and fire, as workers
raced to stay ahead of a full meltdown, The Daily Beast spoke wi... 阅读全帖 |
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f****l
发帖数: 8042 | 32 Some of the maneuvers seemed at odds with the most startling assertion
by Mr. Jaczko (pronounced YAZZ-koe) that there was little or no water in
the pool storing spent nuclear fuel at the No. 4 reactor, leaving fuel
rods stored there exposed and bleeding radiation into the atmosphere.
His testimony before Congress was the first time the Obama
administration had given its own assessment of the condition of the
plant, apparently mixing information it had received from Japan with
data it had collect... 阅读全帖 |
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b**********n
发帖数: 2812 | 33 With Quest to Cool Fuel Rods Stumbling, U.S. Sees ‘Weeks’ of Struggle
By NORIMITSU ONISHI, DAVID E. SANGER and MATTHEW L. WALD
TOKYO — Amid widening alarm in the United States and elsewhere about Japan
’s nuclear crisis, military fire trucks began spraying cooling water on
spent fuel rods at the country’s stricken nuclear power station late
Thursday after earlier efforts to cool the rods failed, Japanese officials
said.
The United States’ top nuclear official followed up his bleak appraisal of
t... 阅读全帖 |
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c****h
发帖数: 4968 | 34 J10:
Combat radius: 1,600 km (with air to air refueling), 550 km (without air to
air refueling)
Ferry range: 1,850 km
F16:
Combat radius: 340 mi (295 nmi, 550 km) on a hi-lo-hi mission with four 1,
000 lb (450 kg) bombs
Ferry range: 2,280 NM (2,620 mi, 4,220 km) with drop tanks |
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c******k
发帖数: 8998 | 35 Zone of total destruction of the Tsar Bomba (as an example – over a map of
Paris): red circle = total destruction (radius 35 kilometres (22 mi)),
yellow circle = fireball (radius 3.5 kilometres (2.2 mi)). |
|
发帖数: 1 | 36 12月 谈谈间谍问题
我一直感觉Reuters 有日本的间谍，他们会通过报道来传递针对华人屠杀的计划，和发
布不利于华人的报道，制造舆论。最重要他们后边的势力和犯罪集团有关。有必要好好
调查这个组织。
How top U.S. colleges hooked up with controversial Chinese companies
By Steve Stecklow and Alexandra Harney
Filed Dec. 2, 2016, noon GMT
New Oriental, China’s biggest private educator, has been accused of
academic fraud. Thanks to two enterprising Americans, it has also gained
access to leading U.S. college admissions officers.
SHANGHAI/SHELTER ISLAND, New York - Thomas Benson once ran a small... 阅读全帖 |
|
t******i
发帖数: 215 | 37 光斑大小的计算见：
http://en.wikipedia.org/wiki/Rayleigh_length
we basically need a collimated laser beam, whose Rayleigh range (zR) is
300km/2 = 150km. assuming wavelength = 1um, then beam radius at waist (w0)
is about 0.2-0.3 m. So at target, the beam radius cannot be larger than 0.5
m. 就是说直径是小于1m的。
以上如有错误请指正。
1m |
|
l****z
发帖数: 29846 | 38 WASHINGTON (AP) — The Federal Aviation Administration created a no-fly zone
over the site of two explosions at the annual Boston marathon on Monday,
and briefly ordered flights bound for Boston's Logan International Airport
held on the ground at airports around the country.
About an hour after the explosions the FAA issued a notice to pilots that a
no-fly zone with a 3.5-mile radius has been created over 811 Boylston Street
. The zone was later reduced in a subsequent notice to a 2.3-mile radius... 阅读全帖 |
|
f*****y
发帖数: 142 | 39 周末研究一下车车的suspension原理，彻底弄清出了如何拆装drive axle
以及alignment调整的原理。下面简单的讨论一下，大家有什么意见来说说吧。
（抱着shop manual读了半天，感觉比修车安全，不会拧断螺丝。hoho）
首先，alignment主要的调整在upper arm, radius rod以及tie-rod上，
分别对应alignment的三个技术指标，chamber, caster, and toe-in。
具体的含义，参见精华区，以及google上面的搜索。
upper arm属于弹簧上部出来的一个铁块，用来连接ball joint，从而
支持knuckle（比较粗壮的实心铁家伙，赫赫）。上面有两个螺丝，连接
upper arm与ball joint，这两个螺丝松开以后，因为upper arm上面
不是一个圆孔，而是长条形孔，因此可以移动ball joint固定的位置，
从而调整chamber。
radius rod从车前部一个横着的承重铁板连接到lower arm上，通过
调节靠近这个承重块的地方的一个螺丝，可以控制其长短，实现不同的caster |
|
f******y
发帖数: 270 | 40 这个是coverage，还不少。
"Comprehensive stated coverage that includes all the coverage of Vintage,
Classic and Powertrain plus more."
Brake Group:
Master cylinder, power brake cylinder, vacuum assist booster, hydro boost,
disc brake caliper, wheel cylinders, compensating valve, metal brake
hydraulic lines and fittings. The following ABS Components
are covered: Hydraulic control unit, electronic control processor, wheel
speed sensors, hydraulic pump/motor assembly, pressure modulator valve,
isolation dum... 阅读全帖 |
|
n******7
发帖数: 12463 | 41 今天订了一个二手车，试车的时候在一个2-lane的路上U-turn，结果直接叉到快上路牙
了。。
赶忙倒车，拐进靠路边的lane。
我感觉车速也不快，方向打到底了都。
回来一查，review里面一条写到：
-I used to drive a 24-foot Mack Truck that had a smaller turning
radius than this car. The turning radius is not very good at all. No
such thing as a 3-point turn in this thing. Try 4-6 points. I have
even had trouble pulling a U-turn on four-lane road.
这让我一个新司机如何是好？
求建议，谢谢！ |
|
m******n
发帖数: 6327 | 42 ☆─────────────────────────────────────☆
nowhere7 (折腾) 于 (Sun Mar 27 00:30:16 2011, 美东) 提到:
今天订了一个二手车，试车的时候在一个2-lane的路上U-turn，结果直接叉到快上路牙
了。。
赶忙倒车，拐进靠路边的lane。
我感觉车速也不快，方向打到底了都。
回来一查，review里面一条写到：
-I used to drive a 24-foot Mack Truck that had a smaller turning
radius than this car. The turning radius is not very good at all. No
such thing as a 3-point turn in this thing. Try 4-6 points. I have
even had trouble pulling a U-turn on four-lane road.
这让我一个新司机如何是好？
求建议，谢谢！
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K******S
发帖数: 10109 | 43 EVO's turning radius. LOL
some minivans have turning radius less than 37 ft. |
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f****t
发帖数: 15913 | 45 从转弯半径也可看出来，
2013 ES350 turning radius 18.7'
2013 鸡屎350 turning radius 17.4' |
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g********d
发帖数: 19244 | 48 ☆─────────────────────────────────────☆
felixcat (felixcat) 于 (Tue Jan 22 19:17:24 2013, 美东) 提到:
为了marketing和形象的考虑，一些厂家会把本质是前驱车的产品宣传和“包装”成是
后驱车或者是“给大部分人是后驱印象”的四驱车。
发动机纵置，并不表明它是后驱车；
四驱车里面，后轮得到一半或者比一半还要多的动力，也并不表明它是后驱车；
前驱车的一个本质是：发动机100%或者几乎是100%处于前轮轴的前方。此法则对于很多
消费者来讲不容易操作：稍微高档点的车子，发动机舱都塞得满满的，发动机上面还罩
着很多外围零件和盖子，这样真的很难看出发动机本身的具体位置，还有前轮轴的确切
位置。比方说Audi的所有车子，除了R8之外，从4缸一直到12缸发动机，全部车子都是
发动机100%处于前轮轴前方的，相信很多人从外表上根本想象不到。
这里再提供另一个容易操作的识别方法：看前轮间距（Track Width, Front）和后轮间
距（Track Width, Rear）。
后驱布局的车子，除非是... 阅读全帖 |
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