题型:填空题 Doctors warned against chewing tobacco as a ______for smoking. [ ]A. relaxation B. substituteC. requirementD. satisfaction 查看答案
题型:填空题 如图所示,光滑水平面上放质量均为m的滑块A和斜面体C,在C的斜面上又放一质量也为m的滑块B;用力F推滑块A使三者无相对运动地向前加速运动,则各物体所受的合力[ ]A.滑块A最大 B.斜面体C最大 C.同样大 D.不能判断谁大谁小 查看答案