单项选择题
Which of the turbo-charging methods listed directs the exhaust gases to the turbine at fairly uniform velocity and pressure?（）
A.Constant pressure B.Pulse C.constant velocity D.Axial flow
单项选择题 Which of the following problems will occur if the needle valve in a fuel injection nozzle sticks in the open position?（）
单项选择题 A dry-type exhaust muffler clogged with soot, will cause（）
单项选择题 An operating turbocharged diesel engine that suddenly loses power, is due to a/an（）
