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单选题
609.航后在FAP面板上操作应急灯测试时,应急灯由( ) After flight, operating emergency lamp test on the FAP panel, who supply emergency light power?
A
由DC ESS BUS直接供电 Direct power supply by DC ESS BUS.
B
由EPSU直接供电 Direct power supply EPSU.
C
由DC ESS BUS经EPSU供电 From DC ESS BUS through DC ESS BUS.
答案解析
正确答案：C
解析：
题目解析
这道题目涉及航后在FAP面板上进行应急灯测试时，应急灯的电源供应情况。正确答案是C，即“由DC ESS BUS经EPSU供电”。DC ESS BUS是直流电源总线，EPSU是紧急电源开关组件。在飞机的电气系统中，应急灯通常通过DC ESS BUS供电，而EPSU可以控制电源的分配。因此，在进行应急灯测试时，电源从DC ESS BUS经过EPSU进行供电。
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