解析:看上去gPE4个梯子很容易OS4m其实梯子上下9oFD在一根绳子上nrNf从物理学的角m7a9讲,其实你是f1G1爬一根绳子而5o1J是梯子,一旦iKLv开始爬,梯子Y5bK会不停的旋转qcjx
阻力:1.2350,1.2380,1.2420,1.2470,1.2500