单项选择题
If a diesel engine starts firing, but is unable to come up normal speed, either without load or even under a small load, the cause may be （）
A.insufficient fuel supply B.faulty governor C.high exhaust back pressure D.all of the above may cause this problem
单项选择题 Air in the fuel can cause（）
单项选择题 Which of the following operating procedures should be carried out immediately after any diesel engine is started?（）
单项选择题 Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）
