單項(xiàng)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

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單項(xiàng)選擇題

If scavenge box should be hot, （）would occur.

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

單項(xiàng)選擇題

If exhaust temperatures are too high, you should check （）.

A.air cooler
B.turbocharger
C.charge air
D.A+B+C