题目内容

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

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

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In the standard engine, each cylinder has ______.

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

Spark plug provides the spark which ignites the _______.

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

The ______ of piston movement is called TDC (top dead center).

A. upper limit
B. lower limit
C. limit
D. limits

The ______ of piston movement is called BDC (bottom dead center).

A. lower limit
B. upper limit
C. limit
D. limits