压力表可发出供水压力下限和上限开关信号。
The pressure meters can give the switch signals of up limit pressure and down limit pressure of water supply.
仪表设上、下限二位开关型接点装置，在压力达到设定值时发出信号或通断控制电路，供作业系统自动控制或发讯用。
Instruments based on the lower limit of two switch-contact device, the pressure to set a signal or when the value of on-off control circuit for the operating system's automatic control or the use.
理想气体的压力与分子的动能成正比，它的下限为零。
The pressure in a perfect gas, being directly proportional to the kinetic energy of the molecules, has a lower bound of zero.
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