备用控制面板。它的按钮、显示灯和操作杆都更少，但同样能够进行主要的操作。

The reserve control panel. It has fewer buttons, lights and levers, but it is still able to make the main operations.

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以往经常用自备柴油发电机组、蓄电池、干电池和镍镉电池应急灯作为应急备用电源。

Traditionally, diesel oil-based generators, storage battery, dry battery and emergency lighting equipped Ni-Cd battery are always used as standby emergency power supply.

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法律规定必须随车携带备用的前照灯灯泡。

A spare set of headlight bulbs is a legal requirement.

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