单项选择题
A.increase the exhaust temperature
B.increase the power of
C.reduce the speed
D.increase the fuel consumption
单项选择题 Whilst the engine is turning, check to see that no water is leaking into the crankcase, scavenge air belt, or from （）.
单项选择题 While engine is in operation the piston moves up and down, thus causing the rotation of the （）.
单项选择题 Which of the following would cause a diesel to have black smoke?（）