下列现象中能说明存在大气压的是 ( ) A. 潜水员潜入水下越深 , 所受水的压强越大 B. 口的纸片能托住倒过来的一满杯水而不洒出 C. 高处流下 , 形成瀑布 D. 在三峡大坝旁修建大型船闸
A.
B.
C.
D.
D
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