单项选择题
A.gap B.clearance C.radius D.stroke
The diffuser prevents pressure pulses from one cylinder...
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
The diesel engine must be started before it can run by ...
单项选择题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
