单项选择题
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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A.seized piston
B.defective atomizer
C.scavenge fire
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If exhaust temperatures are too high, you should check （）.
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Defective timing gear in a diesel engine may lead to （）.
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