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