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游堪琼:1、对卡车做受力分析、卡车受重力、支持力、 pF8 #H~ 则由牛顿第三定律 pF8 #H~ P=F/S=G/S=32000/0.5=64000(Pa) pF8 #H~ 2、 pF8 #H~ W=Gh=W η=Fsη s=2h pF8 #H~ ....... (2012-05-03 20:23) pF8 #H~
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