《力和机械》单元测试题三.doc
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7、DIV.MyFav_1321585616904 A:visitedCOLOR: purple; TEXT-DECORATION: underlineDIV.MyFav_1321585616904 SPAN.MsoHyperlinkFollowedCOLOR: purple; TEXT-DECORATION: underlineDIV.MyFav_1321585616904 DIV.Section1page: Section1一、填空题1物体的重力是由于_而产生的,重力在物体上的作用点叫做物体的_。2水总是从高处流向低处是因为水受_的作用,推桌子很难推动,是因为桌子受到_的作用。3物体所受的重力
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- 力和机械 机械 单元测试
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