单选题Which of the following actions should normally be taken during each watch when the auxiliary boilers is in operation?（）Aclean the flame scanner photocell windowBInspect and clean all solenoid valvesClift the safety valves by handDInspect for oil or water leaks
单选题
Which of the following actions should normally be taken during each watch when the auxiliary boilers is in operation?（）
A
clean the flame scanner photocell window
B
Inspect and clean all solenoid valves
C
lift the safety valves by hand
D
Inspect for oil or water leaks
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