短语词组短语elbow bend pipe 肘形弯管;弯头;弯管elbow -pipe flowmeter 弯管流量计elbow sounding pipe 肘式测深管elbow w pipe 弯管flange and elbow bend pipe 法兰盘弯管ge and elbow bend pipe 法兰盘弯管right angle elbow pipe 直角弯管 返回 elbow pipe