题目内容

The piston is fitted with _____piston rings.

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

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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

The connecting rod is attached to the piston by the _______

A. piston rod
B. piston pin
C. cap bolts
D. cap bearing

The bottom ring prevents excessive oil from entering the combustion chamber from the______ .

A. oil pan
B. crankcase
C. fuel tank
D. water pump

The flywheel is bolted to the _____on the rear end of the crankshaft.

A. tail
B. central
C. flange
D. top