One or more units may be turned on remotely, either simultaneously or in sequence, with a simple low voltage switchclosure.
一个或多个单位可以远程开启，同时或顺序，用一个简单的低电压开关关闭。
2
Closure operation of binary relation plays an important role in network, parsing and detection and diagnosis of malfunction in switch circuit.
二元关系的闭包运算在网络、语法分析以及开关电路中的故障检测和诊断等领域有着重要的作用。
3
The utility model relates to a power switch used for a ventilating fan and a special pulling switch used for the closure and the linkage of shutter blades.