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