After all of the air inside vessel is vacuumed by a specific vacuum pump, it can also fill Nitrogen or other gases to ensure a longer life of products. 產品周圍的氣體由真空泵抽成真空后，可根據客戶要求充氮氣或混合氣體，以實現更長的保質期。
The invention discloses a three-chamber continuous crystal whisker generation vacuum furnace for continuously preparing silicon carbide whiskers. 本發明公開了一種連續製備碳化硅晶須的三室連續晶鬚生成真空爐。
Exclusion of air creates a vacuum in the bottle. 瓶子里的空氣排除后就產生真空。
