如图所示用同一�轮组提升重物第一次提升一个物体第二次提升两个等重的重物比较甲乙两种情况下列说法不正确的是 A.第一次拉力f甲小于 Template




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tomski如图所示用同一�轮组提升重物第一次提升一个物体第二次提升两个等重的重物比较甲乙两种情况下列说法不正确的是 a.第一次拉力f甲小于 coloring