单项选择题
Which of the following item is the cause to the damage of parts and excess wearing?（）
A.overload B.the odds of the load C.the default of parts D.overload and the odds of the load
单项选择题 The main purpose of inspection for a running diesel engine is（）
单项选择题 During the diesel engine running, the water level of FW expansion tank should normally kept in the （） level of glass tube.
单项选择题 The normal color of the exhaust gas of the diesel will be （）
