Excessively worn, or polished ends on a diesel engine valve spring, indicate（）<br>A:burned exhaust valves<br>B:excessive spring compression<br>C:spring surge<br>D:worn valve seats

Excessively worn, or polished ends on a diesel engine valve spring, indicate（）
A:burned exhaust valves
B:excessive spring compression
C:spring surge
D:worn valve seats

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