按下按钮是控制关闭和开启。
浪涌电压抑制器用以抑制关闭和开启控制阀时产生的压力波动。
Fluid Energy Controls surge Stop surge Suppressors are designed to dampen the pressure surges caused by rapid closing and opening of flow control valves in any liquid handling system.
点火正时装置：触点必须能够在活塞处于气缸中相关位置时，按时关闭和开启。
Ignition timing devices. The contact points must be timed to close and open in proper relation to the piston positions in the cylinders.
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