单选题The diesel engine must be started before it can run by it self For this purpose （） has to be used.Aa starting systemBthe starting airCa starting operationDA, B and C
单选题
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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