單項選擇題The projection on a shaft designed to change circular motion into up and down or back and fore motion is called ().

A.wheel
B.crankshaft
C.running gear
D.cam


您可能感興趣的試卷

你可能感興趣的試題

1.單項選擇題The process to remove exhaust gases by blowing in fresh air is called ().

A.charging
B.supercharging
C.starting
D.scavenging

3.單項選擇題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

4.單項選擇題The pressurized air is usually cooled to increase the charge air ().

A.viscosity
B.density
C.velocity
D.electricity

5.單項選擇題The pressure of pilot air is usually () than that of starting air.

A.higher
B.lower
C.low
D.high