A.《低壓流體輸送用焊接鋼管》GB/T3091B.《燃?xì)庥寐竦鼐垡蚁┕懿摹稧B15558.1C.《燃?xì)庥娩摴羌芫垡蚁┧芰蠌?fù)合管》CJ/T125D.《水及燃?xì)夤艿烙们蚰T鐵管、管件和附件》GB/T13295
A.1·5B.2C.2·5D.3
A.出口壓力過高B.進(jìn)口壓力過高C.出口壓力過低D.進(jìn)口壓力過低