Cylinders can be supplied with standard valves for gas withdrawal or with siphon tubes connected internally to the valves for liquid withdrawal.
钢瓶可以配有用于气体提取的标准阀门或在内部连接到阀门的用于液体提取的虹吸管。
Difference of pressure makes a liquid flow through a siphon.
压力差使得液体通过虹吸管。
A liquid is made to flow through a siphon.
压力差使得液体通过虹吸管。
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