单项选择题
A.one automatic drain serving both containers
B.two air starting containers of approximately equal size
C.one control air container and one starting air container
D.one additional means of starting the main engine
单项选择题 Injectors for use with heavy fuel oil must be cooled by either water or light oil to （）
单项选择题 If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）
单项选择题 To minimize the formation of carbon deposits on fuel injection nozzles, you should （）