电路板往往被置于从电气上控制继电器开路和闭合的设备上。

The boards are often placed in a mainframe that electronically controls the opening and closing of the relays.

youdao

电路板往往被置于从电气上控制继电器开路和闭合的设备上。

The boards are often placed in a mainframe that electronically controls the opening and closing of the relays.

youdao