下列说法正确的是 A．潜水艇是通过改变所受浮力实现上浮和下潜的

下列说法正确的是

A．潜水艇是通过改变所受浮力实现上浮和下潜的

B．做匀速曲线运动的物体受到的合力一定不为零

C．我们能用吸管喝到汽水，是因为有大气压的存在

D．青藏高原由于海拔高，因此青藏高原的气压大于内地的气压

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下列说法正确的是 A．潜水艇是通过改变所受浮力实现上浮和下潜的

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