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单选题
181如果主电源故障时提供照明的单独和独立子系统。包括带电池的手电筒、提灯等物品。
A
The alone and independent systems used to provide illumination in case of primary electrical power failure. Includes items suchas inertia flashlights,lanterns,etc.
B
The separate and independent subsystemsused to provide illumination in case of primary electrical power failure. Includes itemssuch as inertia flashlights,lanterns,etc.
C
The separate and independent subsystems usedto provide lighting in case of primary electrical power failure. Includesitems such asinertia flashlights,lanterns,etc.
答案解析
正确答案：B
