piping safety valves 中文意思是什麼
piping safety valves
解釋
管道安全閥-
Valves, gauges and other safety fittings for application to boilers and to piping installations for and in connection with boilers - specification for valves, mountings and fittings
鍋爐與鍋爐連接管路用閥門水位計及其它安全管件.第1部分:閥門安裝件和管件規范
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