单项选择题
A.charging B.supercharging C.starting D.scavenging
The process of loop scavenge is that the exhaust will b...
单项选择题The process of loop scavenge is that the exhaust will be via ports （） the air ports and controlled by the same piston.
A.behind B.far from C.adjacent to D.in front of
The primary duty of lube oil is to reduce （） between th...
单项选择题The primary duty of lube oil is to reduce （） between the working parts of an engine.
A.power output B.friction and wear C.indicated pressure D.rated horsepower
The pressurized air is usually cooled to increase the c...
单项选择题The pressurized air is usually cooled to increase the charge air （）.
A.viscosity B.density C.velocity D.electricity
