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洗澡喜欢用手搓灰,发现搓灰的最容易的时候是洗澡完了出来,身上的水快晾干还没干的时候,搓灰最能搓出来。这是为什么? | |
http://www.guokr.com/question/477206/ | |
为什么风扇的叶片使用一段时间后,会聚集一些粉尘(或者污垢)呢? | |
http://www.guokr.com/question/478575/ |
$$ | |
\newcommand{\ud}[1]{{#1^{\dagger}}} | |
\newcommand{\bra}[1]{\left\langle #1\right|} | |
\newcommand{\ket}[1]{\left| #1\right\rangle} | |
\newcommand\Tr{\mathrm{Tr}} | |
\newcommand{\braket}[2]{\langle #1 \mid #2 \rangle} | |
\newcommand\d{\mathrm{d}} | |
\newcommand\I{\mathbb{I}} | |
\newcommand{\avg}[1]{\left< #1 \right>} | |
$$ |
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The New List is here.
Rainy Mood: rainy day
Coffitivity: coffee shop
Sundrown : multiple choices, web-based
// Use Gists to store code you would like to remember later on | |
console.log(window); // log the "window" object to the console |
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➜ ~ brew install R | |
==> Using Homebrew-provided fortran compiler. | |
This may be changed by setting the FC environment variable. | |
==> Downloading http://cran.rstudio.com/src/base/R-3/R-3.1.0.tar.gz | |
Already downloaded: /Library/Caches/Homebrew/r-3.1.0.tar.gz | |
Error: undefined method `[]' for Formula:Class | |
Please report this bug: | |
https://github.com/Homebrew/homebrew/wiki/troubleshooting | |
/usr/local/Library/Formula/r.rb:36:in `install' | |
/usr/local/Library/Homebrew/build.rb:165:in `install' |
(拖了好久,终于有时间回答了。)
没道理啊……电场中Eq=ma可以理解;而引力场中mg=ma,为啥两个m相等? 如果场和引力场比较,也就是说。。。q和m是类似的参数,但是为啥引力场中这个参量等于质量呢?
不太清楚……