manually-operated gate 中文意思是什麼
manually-operated gate
解釋
手動閥門-
Stopvalves for domestic water supply - part 1 : general requirements and tests for manually operated piston type gate valves, stopvalves for tapping valves, gate valves and diaphragm valves ; technical rule of the dvgw
家庭用供水截流閥.第1部分:放水閥門閥和隔膜閥用截
分享友人