Technique of protection insullac of printed circuit board (PCB) has a strong impact on service life of electronic devices in ships.

印制板三绝缘处理对舰用电子设备使用寿命有很大影响,本文讨印制板三绝缘漆喷涂一些改进。

Services no longer run through to Vietnam, and although two or three JF51s were in service in 1987, complete dieselization is imminent.

这条线路已经不提供去越南服务，尽管在1987年还有两三台JF51型机车，但全面内燃化马上就会到来。