单选题Which of the listed items should be secured before performing any maintenance on a solenoid operated air start valve?（）AElectric power and starting airBLube oil standby pump and control airCHydraulic switch and engage jacking gearDMotor drain and pneumatic control system power
单选题
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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