短語詞組短語reduction n valve 減壓閥reduction relay valve 減壓中繼閥reduction pressure valve 空氣減壓閥air reduction pressure valve 空氣減壓閥local reduction valve sleeve 局減閥套steam pressure reduction valve 蒸汽壓力減壓閥proportional pressure reduction valve 比例減壓閥reduction agent reverting valve 還原劑還原閥priority reduction valve 優(yōu)先控制減壓閥 返回 reduction valve