单选题Excessively worn, or polished ends on a diesel engine valve spring, indicate（）Aburned exhaust valvesBexcessive spring compressionCspring surgeDworn valve seats
单选题
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
参考解析
解析：
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