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单选题
WHEN YOU OPEN THE TOILET SERVICE PANEL:
A
A signal from the service panel microswitch is sent to the FAP via the VSC to energize the "SYS INOP" light.
B
A signal from the service panel microswitch energizes the Fill/Overflow/Drain valve to service the toilet system.
C
The waste tank is automatically ventilated for servicing.
答案解析
正确答案：A
