单项选择题
Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.
A.reduce engine horsepower output B.aid in silencing the exhaust noise C.increase the mean effective pressure D.contribute to effective cylinder scavenging
单项选择题 High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.
单项选择题 On most diesel engines, the governor controls the output speed by （）.
单项选择题 Which of the following devices is common to both mechanical and hydraulic governors?（）
