A.CO B.CH4 C.CO2 D.H2
A.真空度=絕對(duì)壓力+大氣壓力 B.真空度=絕對(duì)壓力-大氣壓力 C.真空度=大氣壓力-絕對(duì)壓力
A.0.04% B.0.1% C.0.5% D.1%