来自孙宇新的问题
求浙教版七年级下科学课堂作业本第二单元运动和力第6章摩擦的利和弊（二）的题目,
求浙教版七年级下科学课堂作业本第二单元运动和力第6章摩擦的利和弊（二）的题目,
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2020-10-15 04:52
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樊丽颖
我答了哦1.滑冰时,冰面在冰刀的压力作用下稍有熔化,这层水跟润滑油一样,可以（）摩擦.气垫船的船底跟水面之间有空气垫,从而减小船航行时受到的（）.2.自行车是我们熟悉的交通工具.从自行车的结构和使用来看,它涉...
2020-10-15 04:56:02
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