Exhaust valve grooving and corrosion is caused by certain components of residual fuel oilThese components are sodium, sulfur, and （）.<br>A:vanadium<br>B:carbon<br>C:copper<br>D:ash

Exhaust valve grooving and corrosion is caused by certain components of residual fuel oilThese components are sodium, sulfur, and （）.
A:vanadium
B:carbon
C:copper
D:ash

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