短语词组短語diaphragm -seal pipeline clamping 膜片密封琯道夾持diaphragm m seal flowmeter 膜片式密封流量計diaphragm steam seal gland 隔板汽封reservoir diaphragm cover seal 水庫diaphragm labyrinth seal 隔板汽封Diaphragm -seal manometer 隔膜壓力表 返回 diaphragm seal