利用定�轮动�轮和�轮组分别匀速提升同一重物.在不计绳重和�擦的情况下机械效率最高的是 A.定�轮b.动�轮c.�轮组d.都一样高 Template




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tomski利用定�轮动�轮和�轮组分别匀速提升同一重物.在不计绳重和�擦的情况下机械效率最高的是 a.定�轮b.动�轮c.�轮组d.都一样高 coloring