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zhaoqian59: ½ð±Ò+10 2015-12-30 12:31:01
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zhaoqian59

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2Â¥: Originally posted by peterflyer at 2015-12-29 15:52:35
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dV/da + 3/a*V=1/(¦Ñ*a)*{*Pg-Ph}
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