open bottomed 中文意思是什麼
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An open, flat - bottomed boat with squared ends, propelled by a long pole and used in shallow waters
方頭或平底船一種用於淺水中並用長篙撐船行進的無篷方頭平底船 -
Specification for open bottomed taper plug valves for 1st, 2nd and 3rd family gases up to 200 mbar
壓力可達200毫巴家庭用一類二類和三類燃氣敞口底部錐形旋塞閥規范
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