A.N有=gQH/1000 B.N有=QH/(P1000) C.N有=ρgQH/1000 D.N有=ρQH/1000
A.p=Hρ B.p=Hg C.P=pg D.p=Hpg
A.1.5 B.1.0 C.O.5 D.O.2