單項選擇題

Which of the following may cause that an engine doesnt turn on starting air?（）

A.too low starting air pressure
B.main starting valve closed
C.neither A nor B
D.A and B

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單項選擇題

Poor combustion in a diesel engine can be caused by （）.

A.high compression pressure
B.low intake air temperature
C.low exhaust pressure
D.high scavenge air temperature

單項選擇題

A built-up exhaust valve is one in which （）.

A.the stem and heads are made of different material
B.low-alloy steel is used throughout
C.a replaceable valve disk is welded to the head
D.the self-centering action comes from motion of the valve stem in the guide