There is an electrical preventive maintenance task assigned to the Ground Fault Circuit Interrupter, that requires periodic testing of the unit.
应指定接地故障断路器的电气预防维护任务，此项任务要求对装置进行定期测试。
Customers can request design and maintenance of various brands of pipe and hydraulic machine circuit, the circuit.
可以根据客户要求设计及维修各种品牌弯管机和油压机的油路、电路。
The new material could make it possible to build airplane parts, circuit boards, and other structural components that last longer and require less maintenance than conventional components.
这种新材料可以用于制造飞机部件、电子线路板和其他长期使用但又不需要进行太多维护的部件。
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