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游堪琼:1、对卡车做受力分析、卡车受重力、支持力、 -*A1[Z ? 则由牛顿第三定律 -*A1[Z ? P=F/S=G/S=32000/0.5=64000(Pa) -*A1[Z ? 2、 -*A1[Z ? W=Gh=W η=Fsη s=2h -*A1[Z ? ....... (2012-05-03 20:23) -*A1[Z ?
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