短语词组短语elbow w union 弯头套管spherical elbow union 球面弯头活管接elbow union s 直角弯管接头elbow union joint 弯管连接头elbow of capture union 弯头联管节union elbow -body 卡套式直角接头体;详细翻译Bulkhead Union Elbow 舱壁联盟弯头 返回 elbow union