Valve cages are used on some large diesel engines to （）<br>A:reduce wear on the valve stem<br>B:permit the use of alloy valve seat materials<br>C:reduce heat transfer from the valve seat<br>D:facilitate valve removal for servicing

Valve cages are used on some large diesel engines to （）
A:reduce wear on the valve stem
B:permit the use of alloy valve seat materials
C:reduce heat transfer from the valve seat
D:facilitate valve removal for servicing

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