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。

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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。

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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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According to the NTSB, which is investigating the crash, maintenance records show that an "impedance bond" for the track circuit where the accident occurred was replaced June 17.

CNN: NTSB says train detection system failed in days before D.C. crash