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


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1.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

2.單項選擇題If scavenge box should be hot, ()would occur.

A.seized piston
B.defective atomizer
C.scavenge fire
D.too much LO