709079691 发表于 2014-4-15 16:50
有计算公式啊,http://www.360doc.com/content/11/0921/09/4994612_150023807.shtml3 e. H" R1 T4 }% b$ N( n9 W
应该 L=(VC*S/πD)* ...
709079691 发表于 2014-4-15 16:50
有计算公式啊,http://www.360doc.com/content/11/0921/09/4994612_150023807.shtml
应该 L=(VC*S/πD)* ...
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