基本解释[机械工程]对焊连接阀对于焊毗连阀词组短语短语Buttwelding U valves 对焊连接阀Buttwelding E valves 对焊连接阀Imported Buttwelding valves 进口对焊连接阀专业释义机械工程对焊连接阀对于焊毗连阀