如图所示物体a靠在竖直墙面上在竖直�上的力f作用下ab匀速�下运动则物体a和物体b的受力个数分别为 A23 b34c4 Template




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tomski如图所示物体a靠在竖直墙面上在竖直�上的力f作用下ab匀速�下运动则物体a和物体b的受力个数分别为 a23 b34c4 coloring