您要查找的是不是：
- crescent vacuum stopcock 月牙型真空柱塞
- Buy High Vacuum Stopcock bor. 捷克求购高硼玻璃管。
- straight two-way vacuum stopcock 直型二路真空活塞
- Crescent is a sign of the Muslim religion. 新月形是伊斯兰教的象征。
- Some pumps and all vacuum cleaners work by suction. 有些泵和所有真空吸尘器都是借吸力工作的。
- His wife's death left him a vacuum in his life. 他妻子的去世使他的生活变得空虚。
- Her husband's death left a vacuum in her life. 她丈夫的死使她的生活变得空虚。
- Some people are living in a vacuum. 有些人过着与世隔绝的生活。
- If a water-pipe bursts turn off the stopcock immediately. 水管破裂时要立即关紧旋塞。
- A vacuum cleaner is a handy household tool. 吸尘器是一种使用方便的家庭用具。
- The shop repairs vacuum cleaners. 这家店修理吸尘器。
- The porter turned off the vacuum. 清洁工关掉真空吸尘器。
- high vacuum stopcock 高真空活塞
- The symbol for the speed of light in a vacuum. 表示真空中光速的物理符号
- Sealed under low pressure or a partial vacuum. 抽空密封的在低压或部分真空状态下密封起来的
- The belt is a westward-opening crescent. 成矿带呈西端张开的新月状。
- The planet appeared as a dazzling silver crescent. 那行星的出现就如同银色新月令人目眩。
- Either point of a crescent moon. 月角新月的任一月尖
- Having two points or cusps, as the crescent moon. 有二尖端的有二尖端或尖头的，如月牙
- Ball is evolved by the stopcock. 球阀是由旋塞阀演变而来。
