题目：
起重机把一个质量为0.5t的工件在15s内，匀速的向上提升了6m，则起重机提升工件的功率______W． （g取10N/kg）
答案：
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参考答案：C
起重机把一个质量为0.5t的工件在15s内，匀速的向上提升了6m，则起重机提升工
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