Pistons for modern engines are made of _______.
A cast iron
B steel
C aluminum-alloy
D tin-alloy
第1题
During the power stroke, a force of up to 4000 pounds is suddenly applied to the piston head for _______ times a second.
A 30
B 40
C 70
D 30 to 40
第2题
The shortcomings of the petrol engine in the nineteenth century include the followings except ______.
A unreliable nature of the ignition system
B very expensive and not efficient enough
C no spark plug is used
D high fire risk caused by petrol
第3题
With front drive arrangement or rear-wheel-drive arrangement, ______ transmit the power to the drive wheels.
A piston engine
B gears
C gears and shafts
D diesel engine
第4题
An automobile includes the following major categories: the body, the engine, ______ and the electrical system.
A steering system
B power source
C chassis
D ignition system
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