繁华如梦 发表于 2018-8-6 16:29 举个例子：【二注2011年上午题7】：M恒=0.5gkL²+PkL=0.5X15X6²+20X6=390kNm M活=qkL2(L1+L2/2)=6X4X(2+ ...
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