单项选择题
High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.
A.engine overload B.low combustion temperature C.plugged fuel nozzle holes D.excessive compression pressure
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?（）
单项选择题 Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?（）
