单项选择题
Maintaining the close tolerances in diesel fuel pumps and injectors requires the use of（）.
A.fuel/water separators B.day tanks C.injector test stand D.fuel filters
单项选择题 Lubricating oil should be changed on a heavy duty diesel engine when（）.
单项选择题 If your propeller is racing in rough weather，you should（）.
单项选择题 If you are unable to stop a diesel engine by any other means，you should（）.
