单选题Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?（）ALeaking seal ringBInsufficient heat transfer from the exhaust valvesCBlock cooling water passages to the headDExcessive scavenging air provided to the engine
单选题
Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?（）
A
Leaking seal ring
B
Insufficient heat transfer from the exhaust valves
C
Block cooling water passages to the head
D
Excessive scavenging air provided to the engine
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