Changing spark plugs, air filter, timing belt and other items from maintenance schedule may save you from costly repairs.

根据维护时间表，更换火花塞、空气滤清器、正式皮带和其他配件，这样可以节省维修费用。

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It is responsible for the execution of relaying programs, maintenance of various timing functions, and communicating with its peripheral equipment.

它负责继电保护程序的执行，各定时功能的保持，以及与外部设备的通讯。

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Changes the mechanical timer of Type 420B boiling sterilizer into an electronic timer and adds a display circuit so as to make its timing ocular, operation stable and maintenance easy.

将420B型煮沸消毒器的机械定时器改为电子定时器，并加装显示电路，使其定时直观、工作稳定、便于维修。

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