screwdown 中文意思是什麼

screwdown 解釋
壓下機構
  1. J kind of flanged cast steel screwdown vertical storm valves

    J類法蘭鑄鋼可閉立式防浪閥
  2. Cast steel screwdown vertical storm valves

    鑄鋼立式旋壓排水口止回閥
  3. Bronze screwdown vertical storm valves

    青銅立式旋壓排水口止回閥
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