The diesel engine must be started before it can run by it self For this purpose （） has to be used.<br>A:a starting system<br>B:the starting air<br>C:a starting operation<br>D:A, B and C

The diesel engine must be started before it can run by it self For this purpose （） has to be used.
A:a starting system
B:the starting air
C:a starting operation
D:A, B and C

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