用相同�轮和绳子分别组成如图所示甲乙两个�轮组绳子所能承受的最大拉力相同.不计绳重及�擦两装置匀速提升物体的重力最大时则下列说法正确的 Template




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tomski用相同�轮和绳子分别组成如图所示甲乙两个�轮组绳子所能承受的最大拉力相同.不计绳重及�擦两装置匀速提升物体的重力最大时则下列说法正确的 coloring