在不计绳重和�擦的情况下利用相同器材组成如图所示的甲乙两装置分别用力把相同的物体匀速提升相同的高度若用η甲η乙表示甲乙两装置的机械 Template




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tomski在不计绳重和�擦的情况下利用相同器材组成如图所示的甲乙两装置分别用力把相同的物体匀速提升相同的高度若用η甲η乙表示甲乙两装置的机械 coloring