如图所示b物体在拉力f的作用下�左运动在运动的过程中ab间有相互作用的�擦力则�擦力做功的情况是a ab都克服�擦力做功b Template




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tomski如图所示b物体在拉力f的作用下�左运动在运动的过程中ab间有相互作用的�擦力则�擦力做功的情况是a ab都克服�擦力做功b coloring