单项选择题
The diffuser prevents pressure pulses from one cylinder () another during operation.
A.to interfere with
B.interfering with
C.to help scavenging
D.helping scavenging
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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
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A.air bottle
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