短语词组短语diaphragm -seal pipeline clamping 膜片密封管道夹持diaphragm m seal flowmeter 膜片式密封流量计diaphragm steam seal gland 隔板汽封reservoir diaphragm cover seal 水库diaphragm labyrinth seal 隔板汽封Diaphragm -seal manometer 隔膜压力表 返回 diaphragm seal