单项选择题
A dry-type spark arrestor removes sparks from a diesel engine exhaust by（）
A.increasing the linear velocity of the exhaust gases B.changing directions of exhaust gas flow C.decreasing the temperature of the exhaust gases D.accelerating the exhaust gas through a reduced size orifice
单项选择题 When the ship is going to enter into the harbor,（）
单项选择题 Which of the following represents the significance the fuel oil cetane number?（）
单项选择题 Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?（）
