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游堪琼:1、对卡车做受力分析、卡车受重力、支持力、 Q@7d:v 则由牛顿第三定律 Q@7d:v P=F/S=G/S=32000/0.5=64000(Pa) Q@7d:v 2、 Q@7d:v W=Gh=W η=Fsη s=2h Q@7d:v ....... (2012-05-03 20:23) Q@7d:v
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