標箭孔 的英文怎麼說
中文拼音 [biāojiànkǒng]
標箭孔
英文
mark arrow holes-
Bleach ball valves must be permanently marked externally with : the word bleach ; two opposing directional arrows, one inscribed with flow and the other with vent ; and nsf ( symbol of the national sanitation foundation international, indicating approval for use with potable water )
漂白劑球閥必須在外部永久性標志：漂白劑；兩個反向箭頭，一個標志流向，另一個標志排出孔；以及nsf （美國全國衛生設備基金會國際的標記，表示已認證可用於飲用水） 。Engineering drawing system can draw two dimension curve graphs, main detail drawing and assembly drawing. the curve of internal trajectory and dynamic simulation of particle external trajectory. the detail drawing includes the graph of chamber, grain design, connection body, nozzle, some standard part
工程繪圖可以繪制二維曲線圖和零部件圖，其中二維曲線包括有內彈道壓（推）力?時間曲線、質點外彈道動態模擬曲線；零部件圖包括有標準螺栓與螺紋孔、燃燒室結構圖、裝藥設計截面圖、連接底結構圖、噴管結構圖及火箭發動機總體裝配圖。
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