screwdown 中文意思是什麼
screwdown
解釋
壓下機構-
J kind of flanged cast steel screwdown vertical storm valves
J類法蘭鑄鋼可閉立式防浪閥 -
Cast steel screwdown vertical storm valves
鑄鋼立式旋壓排水口止回閥 -
Bronze screwdown vertical storm valves
青銅立式旋壓排水口止回閥
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