piping and couplings造句

例句与造句

1. Pvc pipe and couplings , polyvinyl chloride , for underground fire service
   地下消防装置用聚氯乙烯
2. Pressure pipe and couplings , glass fiber - reinforced , for underground fire service
   地下消防设备用玻璃纤维增强压力管道和管联接器
3. It's difficult to find piping and couplings in a sentence. 用piping and couplings造句挺难的