题目内容

The fan_____the engine provides a flow of air.

A. at the front of
B. at the rear of
C. at the bottom of
D. at the top of

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The fan at the front of the engine provides a flow of air through the_____as part of the engine's cooling system.

A. coolant
B. radiator
C. thermostat
D. antifreeze

The piston _____connects the piston to the connecting rod.

A. rod
B. pin
C. flange
D. body

The piston is fitted with _____piston rings.

A. four
B. three
C. two
D. one

The top two rings seal the piston to the cylinder wall and prevent _____ from entering the crankcase.

A. air-fuel mixture
B. combustion gases
C. excessive fuel
D. excessive oil