单项选择题

Which of the listed items should be secured before performing any maintenance on a solenoid operated air start valve?（）

A.Electric power and starting air
B.Lube oil standby pump and control air
C.Hydraulic switch and engage jacking gear
D.Motor drain and pneumatic control system power

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船舶电气与船舶安全

Which of the listed items should be secured before performing any maintenance on a solenoid operated air start valve?（）