单选题Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）AElectricBHydraulicCAirDAll of the above
单选题
Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）
A
Electric
B
Hydraulic
C
Air
D
All of the above
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