A built-up exhaust valve is one in which （）.<br>A:the stem and heads are made of different material<br>B:low-alloy steel is used throughout<br>C:a replaceable valve disk is welded to the head<br>D:the self-centering action comes from motion of the valve stem in the guide

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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