如图所示两个用同种材料制成的圆柱体a和bb的横截面积是a的3倍将a竖直放在水平地面上b竖直放在a上如图甲所示这时a对地面的压强与b Template




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tomski如图所示两个用同种材料制成的圆柱体a和bb的横截面积是a的3倍将a竖直放在水平地面上b竖直放在a上如图甲所示这时a对地面的压强与b coloring