《功和机械能》单元检测题三.doc
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9、T: 0cm; FONT-FAMILY: 宋体DIV.MyFav_1326680400369 SPAN.CharChar1FONT-FAMILY: 宋体DIV.MyFav_1326680400369 DIV.Section1page: Section1一、选择题(本题共15小题,每小题3分,共45分。每小题只有1个选项符合题意,把正确选项前面的字母填在题干后的括号内,选对的得3分,多选、错选均不得分)1下图所示的几种情况中,人对物体做了功的是( )2小明同学值日时用水桶提水从一楼上到三楼,他做的有用功是( )A对桶所做的功 B对水所做的功C对水和桶所做的功 D对水、桶和人所做的功3粗糙水平面上
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- 功和机械能 机械能 单元 检测
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