单项选择题
If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST （）
A.place standby cooler in operation B.reduce engine load C.check thermostatic valve D.clean sea water strainer
单项选择题 Which of the following conditions can cause excessive lube oil consumption in a diesel engine?（）
单项选择题 In the common rail system, excessive pressure in the header may be caused by （）
单项选择题 Diesel engine valve springs function to （）
