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例1如图,两个滑轮组,其中半径相同的滑轮其质量也相同.用它们分别将重物G_1、G_2提高相同高度(忽略摩擦和绳重).
Example 1 As shown in the figure, two pulley blocks, of which the same radius are of the same mass, raise the weights G_1 and G_2 by the same height (ignoring friction and rope weight) respectively.