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问题

A built-up exhaust valve is one in which ______.A.the stem and heads are made of different


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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