(2014·常德)将未装满水且密闭的矿泉水瓶,先正立放置在水平桌面上,再倒立放置.如图所示,两次放置时,水对瓶底和瓶盖的压强分别为PA和PB,水对瓶底和瓶盖的压力分别为FA和FB,则( )
A.PA>PB FA>FB | B.PA<PB FA=FB | C.PA<PB FA>FB | D.PA=PB FA<FB |
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(2014·常德)将未装满水且密闭的矿泉水瓶,先正立放置在水平桌面上,再倒立放置.如图所示,两次放置时,水对瓶底和瓶盖的压强分别为PA和PB,水对瓶底和瓶盖的压力分别为FA和FB,则( )
A.PA>PB FA>FB | B.PA<PB FA=FB | C.PA<PB FA>FB | D.PA=PB FA<FB |
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