x****u
发帖数: 44466 | 1 你这就是自己新定义了
AI的符号主义就是用电脑逻辑推理符号，你用google一搜结果也一样：
Symbolic artificial intelligence is the collective name for all methods in
artificial intelligence research that are based on high-level "symbolic" (
human-readable) representations of problems, logic and search. Symbolic AI
was the dominant paradigm of AI research from the mid-1950s until the late
1980s. |
|
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ab
发帖数: 37 | 3 ln 有 hardlink and symbolic
which link is perfer.
symbolic will span file system.
但是建了一个symbolic,the file size only 29
而一个hardlink,却和原文件一样大 |
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s****l
发帖数: 78 | 4 Symbolic link is a softlink, which means once you delete the original
file the link is unusable; for hardlink, even if you delete the original file
the link "file" is still there with the complete contents unchanged.
symoblic link is just a symbol
hardlink is a new inode pointing to the real data in harddisk.
both won't used more space than a "tag", but symbolic link
can refer to a folder, hardlink can only point to a file link thing. |
|
c**t
发帖数: 2744 | 5
cogt> make
ld.so.1: make: fatal: relocation error: file make: symbol _setlocale:
referenced symbol not found
Killed
/usr/local/bin> ldd -r make
libelf.so.1 => /usr/lib//libelf.so.1
libsocket.so.1 => /usr/lib//libsocket.so.1
libc.so.1 => /usr/lib//libc.so.1
libnsl.so.1 => /usr/lib//libnsl.so.1
libdl.so.1 => /usr/lib//libdl.so.1
libmp.so.2 => /usr/lib//libmp.so.2
symbol not found: _setlocale (make)
All these l |
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S**I
发帖数: 15689 | 6 1. 用WinDbg打开MEMORY.DMP
2. File -> Symbol File Path，输入
SRV*C:Symbols*http://msdl.microsoft.com/download/symbols
3. 在WinDbg的命令行里输入
.reload /f
根据你的网速快慢，可能需要等几十秒到几分钟
4. 继续输入
!analyze -v
5. 把输出信息贴上来
**
*
*
* |
|
t******r
发帖数: 28 | 7 1. What is Visual C++?
a.It's a program used for starting other programs.
b.It's a program that you use to create other programs.
c.It's a program for browsing the Web.
d.It's a multimedia program that teaches you how to program.
2.What is the name of the process by which Visual C++ converts your C++
code to a program the computer can understand?
a.Compile.
b.Run.
c.Debug.
d.Build.
3.What do you call the container that stores all the files you write and
all the files Visual C++ writes to create ... 阅读全帖 |
|
w**********m
发帖数: 82 | 8 比如在OFDM系统中，接受信号和发送信号的关系是
y(m)=C(m)X(m)+w(m)
这里，m是time index，C(m)是要估计的channel impulse response vector。
w(m)是高斯白噪声。系统的多普勒频移是fd，可以很高。
通常在time domain中用RLS算法估计第n时刻的C(n)是
min sigma [y(m)-C(m)X(m)]^2 lambda^{n-m}
sigma中的m从0到n。lambda是forgetting factor，小于1.
如果引入smoothing算法的话，估计n时刻的C(n)是
min sigma [y(m)-C(m)X(m)]^2 lambda^{abs(n-m)}
m从0到整个Packet的结尾。
现在的simulation 结果是用了smoothing反而效果变差了。
确实比较想不通。那位能解释一下？
再说一下packet的结果。有4个pilot symbol，加上10个data symbol。
后面的data symbol的估计值是通过decision directed方式得到的。 |
|
V******i
发帖数: 306 | 9 fs smapling rate means your maximum rate of (independent) symbols is fs/2
symbol/sec. But each symbol can carry more than one bit. |
|
f*********t
发帖数: 37 | 10 I am not 高人.
You cannot know the modulated signal bandwidth just from the symbol rate.
This really depends on your modulation scheme. Like in GSM system, symbol
rate is 270.08333kHZ. The baseband bandwidth of the signal is only 100kHz.
When your symbol rate is higher than two times of the bandwidth of a
baseband signal, then ISI cannot be avoided. We need equalization to detect
signal.
note: GSM channel is usually known to be 200KHz, this number is passband
bandwidth after modulated on radio fre |
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t****t
发帖数: 6806 | 11 GSM data rate is 270.833kbps, not symbol rate. 1 symbol can have multiple
bits.
if symbol rate is 270k, then bandwidth will be at least half of it. that's
nyquist theorem.
detect |
|
z*****n
发帖数: 7639 | 12 Well, does the OP's 100"symbol"/sec mean bitps or byteps?
I take bit here.
For PSK (and I assume 2PSK here) applied, as long as
the receiver can detect the phase correctly, the carrier
frequency can be the same as the symbol rate, which means
in each symbol interval if the carrier can complete one
2*pi cycle, the detector can figure the data out.
50Hz，但是调制
要传双边带信号，
关系啊， |
|
f*********t
发帖数: 37 | 13 "if symbol rate is 270k, then bandwidth will be at least half of it. that's
nyquist theorem. "
Are you sure Nyquist said that?
To my understand, Nyquist said if the bandwidth is less than half of the
symbol rate then you cannot achieve ISI (inter symbol interference) free
transmission. ISI is just a kind of distortions you can correct at receivers
. This means you still can transmit the data with this rate, you just have to deal with the ISI at receivers.
If you really want to know what will be |
|
t****t
发帖数: 6806 | 14 ok, i am not familiar with GSM. but i checked it just now, seems the
bandwidth is 200K, instead of 100K.
as for nyquist, if the bandwidth is W Hz, then you can reconstruct the
waveform with >2W/s sample rate, right? of course you can transmit more than
that much symbols and filter the extra band out, but that's still
equivalent to transmit 2W symbol/s, with a different symbol table.
s
receivers
have to deal with the ISI at receivers.
look at the channel capacity theorem instead of Nyquist theor |
|
C******e
发帖数: 1850 | 15 ok, so with a bandwidth of R/2, the carrier must be at least R/2 Hz as
well to be able to transmit the whole band. But in v.90 modem, R is 8000
symbols/sec (or 64kbps with 8-bit/symbol), however, the carrier frequency
is only 1650Hz. How could this happen? What is missing here?
symbols.
then
question, no |
|
i********n
发帖数: 53 | 16 是啊，每个用户都用symbol extension的话。但是super symbol 对应的是每个symbol
必须经历independent fading，暗含的假设就是需要code across n diversity
branch。
不知道是否有其他解释，因为印象中Jafar 在distributed interference alignment里
谈到了接收端只需知道interfernce covariance matrix 即可用algorithm找到
precoding matrix, 并且不需要n =\infty即可实现d.o.f.=1/2 per user, 不知道这个
理解是否正确。 |
|
r**********r
发帖数: 13 | 17 LTE中每个symbol前有一个Cyclic Prefix (CP, 4.7 us). CP is just a repeat of
the end of the previous symbol, and is used to give a "settling time" to
allow for delay spread in propagation channel.
Does this meant that if the multipath delay is longer than 4.7 us, the LTE
system will suffer from significant inter symbol interference?
If no, what am I missing here?
谢谢了. |
|
u***l
发帖数: 2 | 18 In OFDM transmitter, the modulated symbols need to be pulse shaped before
transmitting. I built a filter in Matlab2013a using
d = fdesign.pulseshaping(16,'Raised Cosine', 'Ast,Beta', 60, 0.3);
H = design(d);
fvtool(H);
In previous Matlab version, a function can be used both for filter design
and apply to IFFTed symbol data:
rcosflt(subcarriers, 1, 20, 'fir',0.4,10)
However in 2013a version, I couldn't find information to apply this filter
to IFFTed symbol data. Does anybody know how to do it?
Th... 阅读全帖 |
|
m******r
发帖数: 1904 | 19 Space is limited.
Reserve your Webinar seat now at:
https://www4.gotomeeting.com/register/361287871
let work hard and be a team!
Title: 4th season match tal---luludd
Date: Thursday, April 19, 2012
Time: 7:00 PM - 12:00 PM EDT
After registering you will receive a confirmation email containing
information about joining the Webinar.
System Requirements
PC-based attendees
Required: WindowsRegistered trademark symbol 7, Vista, XP or 2003 Server
MacintoshRegistered trademark symbol-based attendees
... 阅读全帖 |
|
h**s
发帖数: 1757 | 20 请麦穗们抓紧时间注册，7：45左右如有任何空位，班务会将连接贴至版面。如因为注册过晚
，原先有连接而不能加入的，班务也无能为力。请奔走相告！！！
Space is limited.
Reserve your Webinar seat now at:
https://www4.gotomeeting.com/register/295667343
the end... never end... let us together!
Title: 4th season match talk -sleepycoffee
Date: Saturday, April 21, 2012
Time: 7:00 PM - 12:00 PM EDT
After registering you will receive a confirmation email containing information about joining the Webinar.
System Requirements
PC-based attendees
Required: WindowsRegistered tradema... 阅读全帖 |
|
m******r
发帖数: 1904 | 21 ☆─────────────────────────────────────☆
medwater (小麦) 于 (Thu Apr 19 19:23:27 2012, 美东) 提到:
Space is limited.
Reserve your Webinar seat now at:
https://www4.gotomeeting.com/register/361287871
let work hard and be a team!
Title: 4th season match tal---luludd
Date: Thursday, April 19, 2012
Time: 7:00 PM - 12:00 PM EDT
After registering you will receive a confirmation email containing
information about joining the Webinar.
System Requirements
PC-based attendees
Required: WindowsRegistered tr... 阅读全帖 |
|
m******r
发帖数: 1904 | 22 ☆─────────────────────────────────────☆
hmis (hmis) 于 (Sat Apr 21 19:18:20 2012, 美东) 提到:
请麦穗们抓紧时间注册，7：45左右如有任何空位，班务会将连接贴至版面。如因为注册过晚
，原先有连接而不能加入的，班务也无能为力。请奔走相告！！！
Space is limited.
Reserve your Webinar seat now at:
https://www4.gotomeeting.com/register/295667343
the end... never end... let us together!
Title: 4th season match talk -sleepycoffee
Date: Saturday, April 21, 2012
Time: 7:00 PM - 12:00 PM EDT
After registering you will receive a confirmation email containing information about j... 阅读全帖 |
|
r*****t
发帖数: 286 | 23 ☆─────────────────────────────────────☆
lhict (至少还有我) 于 (Sun Feb 4 01:17:03 2007) 提到:
I had a phone interview with Worldquant today
for a position of C++/linux. The questions are as follows,
1. In database, what is left join ?
2. for a table, with 2 columns,
C1 | C2
----------------
Id | Symbol
Id is the primary key, the symbol could be duplicate,
write SQL to select all the duplicate symbols in table.
3. Perl, write a regular expression to delete all the 'M' chararter
in a string.
4. ... 阅读全帖 |
|
r****y
发帖数: 1437 | 24
div and curl
Just
help curl
help div
you will know how to use it.
But they are for numerical purpose. I do not think there are
similar commands for symbolic operation. But you can write a simple one
for symbolic operation by yourself, it is not too hard to do it. Or maybe
you can call Maple function from matlab if there are such function in Maple.
Unless simple symbolic operation, Matlab is not a good tool because
its interface is |
|
s**a
发帖数: 8648 | 25 CALL FOR PAPERS
The Center for International History at Columbia University
announces:
SYMBOLS OF EXCLUSION
A Graduate Student Conference
April 4, 2008
Deadline for abstract submission
(extended): January 31, 2008
From the totem to the noose, symbols have been used not only to
unify people, but also to signify the exclusion of particular
groups from social, ethnic, religious, or national communities.
This conference seeks to address the following questions: How have
symbols accrued meanings and |
|
a******6
发帖数: 78 | 26 一个简单的程序，不知道哪里出了问题，请各位大虾指点一下：
谢谢
#include
#include
#include
#include
int main()
{
double a[3];
int i;
GetRNGstate();
for(i=0;i<=3;i++)
{
a[i]=rnorm(0.0,1.0);
printf("a[%2d]=%f \n",i,a[i]);
}
PutRNGstate();
}
错误如下：
Linking...
test.obj : error LNK2001: unresolved external symbol _PutRNGstate
test.obj : error LNK2001: unresolved external symbol _Rf_rnorm
test.obj : error LNK2001: unresolved external symbol _GetRNGsta |
|
g*******y
发帖数: 380 | 27
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I'm confused about this one. If there is local table, then local macro
variable will be created? then how do you create a local table?
According to the online tutorial:
The macro process as following:
Does macvar already exist in the local symbol table?
Yes--> Update macvar in the local symbol table with the value value.
No-->Does macvar already exist in the global symbol table? |
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w********e
发帖数: 944 | 28 SAS fisrt checks if there is a macro var called a in the local symbol table.
If yes, update a with value test. Otherwise, SAS checks if a is in the
global symbol table. If yes, update a's value using test. Otherwise, create
a macro var called a in the local symbol table and set its value as test.
Read the book or tutorial carefully. |
|
y****1
发帖数: 400 | 29 1. The following SAS program is submitted:
%macro one(input);
%two;
%mend;
%macro two;
data _null_;
call symputx ('date','12SEP2008','L');
run;
%put the value is &date;
%mend;
%let date=31DEC1006;
%one(&date)
What is the result when the %put statement executes?
答案是12SEP2008 retrieved from the local symbol table for the TWO macro.
我在网上查了call symputx routine的用法，关于L的解释是：
L specifies that the macro variable is stored in the most local symbol
table that exists, which might be the global symbol table. |
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L******n
发帖数: 6 | 30 75. The following SAS program is submitted:
%macro one(input);
%two;
%mend;
%macro two;
data _null_;
call symputx ('date','12SEP2008','L');
run;
%put the value is &date;
%mend;
%let date=31DEC1006;
%one(&date)
What is the result when the %put statement executes?
答案是12SEP2008 retrieved from the local symbol table for the TWO macro.
为什么不是12SEP2008 retrieved from the local symbol table for the ONE macro
？我的理解macro two 并没有local symbol table啊。
谢谢。 |
|
h****o
发帖数: 119 | 31 SAS ADV 130的第81题:
%macro one;
data _null_;
call symput('proc','means');
run;
proc &proc data=sashelp.class;
run;
%mend;
%one()
What is the result?
A. The macro variable PROC is stored in the local symbol table.
B. The macro variable PROC is stored in the global symbol table.
C. The macro variable PROC is stored in the SAS catalog WORK.SASMACR.
D. The program fails to execute because PROC is a reserved word.
被GLOBAL和LOCAL SYMBOL TABLE弄晕了.为什么答案是B而不是A呀?
CALL SYMPUT不是用在MACRO DEFINITION中吗?那么,所生成的MACR... 阅读全帖 |
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b**********i
发帖数: 1059 | 32 CALL SYMPUT may not create a GLOBAL macro variable when defined inside a
macro definition. When we use
CALL SYMPUT inside a macro definition, it will write the macro variable
values into a local symbol table, if the
macro has a non empty local symbol table. If macro has an empty local symbol
table, the macro variable defined
inside a macro, using CALL SYMPUT routine has global scope. The rules do not
apply when you explicitly define
them as GLOBAL or LOCAL. |
|
h********o
发帖数: 103 | 33 You example is a case of using CALL SYMPUT with complete DATA step and a
nonempty Local Symbol Table since you have a paramter. then your new created
macro variable is local to that data step. you can define the macro
variable as global macro variable or use it within an incomplete DATA step.
===========
%let list=2;
%macro test(one_var);
data _null_;
if "&one_var"="1" then call symput("sss", "&list");
%mend;
run;
%test(1)
%put &sss;
If you use CALL SYMPUT with a complete DATA step and an em... 阅读全帖 |
|
t*****8
发帖数: 157 | 34 程序如下：
data _null_;
set cnt;
i+1;
ii=left(put(i,2.));
call symput('name'||ii,clinname);
%put &&name&i;
run;
log:
WARNING: Apparent symbolic reference I not resolved.
WARNING: Apparent symbolic reference NAME not resolved.
WARNING: Apparent symbolic reference I not resolved.
&name&i
但是我加了LOOP在下面就可以了，为什么？
%do i=1 %to &sqlobs;
%put &&name&i;
%end; |
|
o*****y
发帖数: 699 | 35 将新语丝上的两篇文章贴在下面。其实我觉得刘嘉忆还是不错的，这么年轻
就能解决一个难题。关于“西塔潘的猜想”的难度，刘目前的导师也说过不
能和那些难度很大的猜想比。但作为一个本科生，还是不错了。至于文章
查不到，我想文章从投稿，到接收，和发表要一段时间。这点我是觉得应该
不会有假的。如果这个都是假的，那可是国际丑闻了。
方舟子关注此事也有好处，真正有水平的科研是应该能经得起别人的质疑的。
如果正式文章出来了，也可以消除一些疑点。
http://xys.org/xys/ebooks/others/science/dajia13/liulu.txt
中南大学本科生正教授刘路（刘嘉忆）所宣称发表的文章在SCI查无此文
我是目前在读美国某大学的研究生。最近读到中南大学本科生刘路（笔名刘
嘉忆）因为破解“西塔潘的猜想” (Seetapun enigma)而被破格聘请为数学系正
教授的报道。
中南大学22岁学生成我国最年轻正教授级研究员
http://www.sina.com.cn 2012年03月20日18:05 新华网
新华网长沙3月20日电(记者黄兴华)20日，中南大学召开的新闻发布会上，校长... 阅读全帖 |
|
|
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y*****l
发帖数: 5997 | 38 AVARF今天还是OTC，明天是AVL，+20%, 太猛了。
Avalon Rare Metals Authorized to Trade on NYSE Amex
Tuesday 12/21/2010 12:57 PM ET - Marketwire Canada
Related Companies
Symbol Last %Chg
AVARF 4.73 18.41%
As of 2:34 PM ET 12/21/10
Avalon Rare Metals Inc. (TSX:AVL)(OTCQX:AVARF) ("Avalon" or the "Company")
is pleased to announce that its common shares have been authorized for
listing on the NYSE Amex ("NYSE Amex") in New York. The shares will begin
trading on Wednesday, December 22, 2010 under the ticker symbol "AV... 阅读全帖 |
|
t**e
发帖数: 2379 | 39 得跟平均每日short量和平均short interest比较
可惜这些数据是分日的，而不是分symbol的。
若是版上有某位会编程的，愿意写个程序并和大家分享就好了。就是程序里输入一个
symbol，就自动到这个网址上所有的每日数据链接里，找到这个symbol，并把那一行数
据下载下来并汇总成表格。
我愿意出所有包子。 |
|
x*********s
发帖数: 5554 | 40 http://www.tektonics.org/af/femanoint.html
The Gospels offer several stories of women who come to anoint Jesus. Some of
these are clearly parallels, but one seems not to be.
The parallel stories are found in Matt. 26, Mark 14, Luke 7, and John 12. It
is my argument that we have only two incidents reported, but by only two
different women -- Mary the sister of Martha (Matthew, Mark and John), and
an unnamed woman who was a sinner (Luke).
Some preliminary critical questions:
Is it likely that ther... 阅读全帖 |
|
h*h
发帖数: 27852 | 41 感觉很可能。卡达菲是疯狗
Witnesses describe violence, chaos in Libyan cities
By the CNN Wire Staff
February 21, 2011 1:25 p.m. EST
(CNN) -- While state TV bounced between scenes of serene concert footage and
orderly rallies in support of leader Moammar Gadhafi, eyewitnesses describe
a far different, far more chaotic Libya -- one with arms-toting mercenaries
, demonstrators ramming stolen tanks into a military base and masked men
firing guns and blasting pro-government tunes from their sport utility
vehicles... 阅读全帖 |
|
M*****8
发帖数: 17722 | 42 【 以下文字转载自 TraderSuccess 俱乐部 】
发信人: MB80528 (肥猫(Contrarian)[食MM而肥]), 信区: TraderSuccess
标 题: 今天 TraderSuccess(tm) 电子信的内容 (March 22, 2011)
发信站: BBS 未名空间站 (Wed Mar 23 13:02:39 2011, 美东)
有免费的 eMail Newsletter:
欢迎订阅。
http://StockCounsel.com/pm/user/subscribe.php
=================================================
MCP Now Bearish (March 22, 2011)
We now confirm that MCP is over-extended and bearish.
http://yhoo.it/eEiguu
Here is the latest forecasts (as of last night, March 22, 2011):
SYMBOL, DATE... 阅读全帖 |
|
e****i
发帖数: 2152 | 43 【 以下文字转载自 Military 讨论区 】
发信人: erkuai (三天不上bbs,赶得上刘少奇), 信区: Military
标 题: On the Jews and Their Lies, 1543
发信站: BBS 未名空间站 (Wed Jan 12 23:21:23 2011, 美东)
by Martin Luther (1483-1546)
Translated by Martin H. Bertram
copyright © 1971 Fortress Press & Augsburg Fortress - On the Jews and
Their Lies is from Luther’s Works Volume 47. Augsburg Fortress is the
publishing ministry of the Evangelical Lutheran Church in America.
Funded through sales revenue, Augsburg Fortress is called to provide
produ... 阅读全帖 |
|
d*****u
发帖数: 17243 | 44 【 以下文字转载自 Military 讨论区 】
发信人: daigaku (๑۩۞۩๑), 信区: Military
标 题: 匈牙利立法禁用纳粹符号和镰刀锤子符号
发信站: BBS 未名空间站 (Thu Apr 25 17:56:30 2013, 美东)
纳粹和共产主义
BUDAPEST, Hungary -- Hungary's parliament has overwhelmingly approved a modi
fied plan to restrict the display of Nazi and communist symbols such as the
swastika and red star.
Similar rules were declared unconstitutional in February because they were f
ound to be too broad and an excessive restriction on freedom of speech. But
la... 阅读全帖 |
|
b*****e
发帖数: 5476 | 45 牛津字典：
http://www.oxforddictionaries.com/page/91
Many suggestions have been made about the origin of the dollar symbol $, one
of the commonest being that it derives from the figure 8, representing the
Spanish 'piece of eight'. However, it actually comes from a handwritten 'ps'
, an abbreviation for 'peso' in old Spanish-American books. The $ symbol
first occurs in the 1770s, in manuscript documents of English-Americans who
had business dealings with Spanish-Americans, and it starts to appear in
p |
|
s*********8
发帖数: 901 | 46 BEIJING – This weekend's arrival of a U.S. aircraft carrier in the Yellow
Sea poses a dilemma for Beijing: Should it protest angrily and aggravate
ties with Washington, or quietly accept the presence of a key symbol of
American military pre-eminence off Chinese shores?
The USS George Washington, accompanied by escort ships, is to take part in
military drills with South Korea following North Korea's shelling of a South
Korean island Tuesday that was one of the most serious confrontations since
th... 阅读全帖 |
|
s*********8
发帖数: 901 | 47 BEIJING – This weekend's arrival of a U.S. aircraft carrier in the Yellow
Sea poses a dilemma for Beijing: Should it protest angrily and aggravate
ties with Washington, or quietly accept the presence of a key symbol of
American military pre-eminence off Chinese shores?
The USS George Washington, accompanied by escort ships, is to take part in
military drills with South Korea following North Korea's shelling of a South
Korean island Tuesday that was one of the most serious confrontations since
th... 阅读全帖 |
|
x**n
发帖数: 1936 | 48 US carrier visit a dilemma for China
BEIJING – This weekend's arrival of a U.S. aircraft carrier in the Yellow
Sea poses a dilemma for Beijing: Should it protest angrily and aggravate
ties with Washington, or quietly accept the presence of a key symbol of
American military pre-eminence off Chinese shores?
The USS George Washington, accompanied by escort ships, is to take part in
military drills with South Korea following North Korea's shelling of a South
Korean island Tuesday that was one of the... 阅读全帖 |
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发帖数: 901 | 49 WASHINGTON – President Barack Obama on Monday called for freezing the pay
of 2 million federal employees, saying the move is the first of many
difficult decisions that must be made to slash the nation's mounting
deficits.
"The hard truth is that getting this deficit under control is going to
require some broad sacrifice, and that sacrifice must be shared by the
employees of the federal government," Obama said.
The two-year freeze would apply to all civilian federal employees, including
those wor... 阅读全帖 |
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发帖数: 17722 | 50
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http://stockcounsel.com/!Guide.htm
FORECASTS ON TICKER SYMBOL: TLT
SYMBOL, DATE, PRICE, FORECAST, PERCENT
TLT, 20110105, 91.4800, 0.9947, 1.1
TLT, 20110104, 93.4400, -0.5294, -0.6
TLT, 20110103, 93.2100, -0.5135, -0.6
TLT, 20101231, 94.1300, -1.8802, -2.0
TLT, 20101230, 93.2900, -0.0212, -0.0
TLT, 20101229, 93.0200, -0.3928, -0.4
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