①分别接通各个接触器，依次拨通相应的限位开关和过电流继电器常闭触头，查看其切断控制电流的能力。
Respectively through the various contacts, in order to dial the corresponding limit switches and over current relay normally closed contacts, to see the ability to cut off the control current.
低压或高压开关- - -用于当水压降低到预先设置的最低值或超过预先设置的最高值时，切断控制电流。
Low or high pressure switch - turns off control circuit when water pressure drops below a set minimum, or above a set maximum.
这些联合体通过切断某些基因控制DNA活动。
These complexes control the activity of DNA by shutting off certain genes.
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