mercury plunger relay

例句：

1. 1. The mercury plungerrelay is used to control the flow ofelectricity in circuits.
   水银柱压力继电器用于控制电路中的电流流动。
2. 2. The mercury plunger relay was designed toprovide a reliable and accurate signal.
   水银柱压力继电器被设计为提供可靠和准确的信号。
3. 3. The mercury plungerrelay is commonly used in industrial applications whereprecise timing is required.
   水银柱压力继电器在工业应用中被广泛使用，需要精确计时的情况下。