单项选择题
A.of the thin wall thickness
B.honing makes it easier to maintain the desired oil ilm
C.water seals are not required
D.it fits more loosely due to a decrease in heat transfer through the composite wall
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?（）
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（）