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wake2000

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222312 
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注册时间
2011-7-2 
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2015-12-9 
1# 跳转到 »
发表于 2011-7-13 17:26 | 显示全部帖子
what does it matter? just memorize it, then forget it after the test. If a conceptual question happens to be asked you should be able to back out the answer by knowing the formula

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