A.1B.4C.0.2D.0.5
A.5%~8%B.15%~30%C.35%~50%D.60%~70%
A.減壓閥出口壓力降為零B.減壓閥出口壓力波動(dòng)C.減壓閥入口壓力降為零D.減壓閥入口壓力波動(dòng)