A diesel engine may be hard to start if the （）<br>A:air intake is restricted<br>B:engine is cranked too fast<br>C:vibration dampener is faulty<br>D:exhaust back pressure is low

A diesel engine may be hard to start if the （）
A:air intake is restricted
B:engine is cranked too fast
C:vibration dampener is faulty
D:exhaust back pressure is low

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