第1题
The mass production of the automobiles has affected the society history in the 20th century most of all the inventions.(翻译)
第2题
With the introduction of computers and electronic devices, the modern vehicle’s electrical system is becoming more and more complex.(翻译)
第3题
The connecting rod is made of ______.
A cast iron
B forged alloy steel
C aluminum-alloy
D sheet steel
第4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
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