1. 玻璃活塞：滴定管 burette | 玻璃活塞 stopcock | 搅拌装置 stirring device
2. 气流开关：motor 步进电机 | stopcock 气流开关 | suction 吸引
3. 水掣;活塞：stop notice 停止发展通知书 | stopcock 水掣;活塞 | stopping 填补
4. 活栓：原料泵 stock pump | 活栓 stopcock | 汞封栓 stopcock; mercury seal
1. 活塞;活栓;旋塞阀
A stopcock is a tap on a pipe, which you turn in order to allow something to pass through the pipe or to stop it from passing through.