A.開啟上游閥 B.關(guān)閉上游閥 C.開啟下游閥 D.關(guān)閉下游閥
A.±2.5% B.±0.35% C.±1.0% D.1.5%
A.±0.2%(體積) B.±0.35% C.±1.0% D.1.5%