本课配套习题挑战模式1/5

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单选题
难度系数:

1.

如图中甲所示,两个实心长方体A、B叠放在水平面上,已知密度之比ρA:ρB=2:1,底面积之比SA:SB=1:2,高度之比hA:hB=3:2. 将B放在水平地面上,A叠放在B上面,如图甲所示,B对地面的压强为pB;若把B叠放在A上,如图乙所示,B对A的压强为pB′,则pB:pB′为(  )



A:

2:1

B:

1:2

C:

5:4

D:

4:5

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