第1题
The connecting rod is made of ______.
A cast iron
B forged alloy steel
C aluminum-alloy
D sheet steel
第2题
The function of the piston rings is to ________.
A help cool the piston by transferring heat from the piston to the cylinder wall
B provide a sliding seal between the piston and cylinder wall
C scrape oil off the cylinder wall as the piston moves down on the power and intake strokes.
D all of the above
第3题
Pistons for modern engines are made of _______.
A cast iron
B steel
C aluminum-alloy
D tin-alloy
第4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
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