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单选题
应急照明是指单独的、独立的子系统，在主电源故障的情况下提供照明。
A
A.Emergency illumination refers to an individual and dependent subsystem which is used to provide lighting when the main electrical power fails.
B
B.Emergency lighting can provide illumination for an individual and independent subsystem in case of main electrical power failure.
C
C.Emergency lighting is the separate and independent
subsystem used to provide illumination in case of primary electrical power failure.
答案解析
正确答案：C
相关知识点：
应急照明主电源故障时照明
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