如图所示物体a靠在竖直墙壁上在竖直�上的力f作用下ab一起匀速�上运动.则物体a和物体b的受力个数分别为 A.23b.34c Template




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tomski如图所示物体a靠在竖直墙壁上在竖直�上的力f作用下ab一起匀速�上运动.则物体a和物体b的受力个数分别为 a.23b.34c coloring