709079691 發(fā)表于 2014-4-15 16:50
有計算公式啊,http://www.360doc.com/content/11/0921/09/4994612_150023807.shtml# u" Q- i1 i/ N# [- K/ p; P6 G
應該 L=(VC*S/πD)* ...
709079691 發(fā)表于 2014-4-15 16:50
有計算公式啊,,http://www.360doc.com/content/11/0921/09/4994612_150023807.shtml! {- |, @# v. v7 Q" w, i8 N
應該 L=(VC*S/πD)* ...
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