题目内容

Spark plug provides the spark which ignites the _______.

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

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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

A _____ is piston movement from TDC to BDC or from BDC to TDC.

A. state
B. starter
C. stage
D. stroke

The_____ order for a four-cylinder engine is 1-3-4-2 or 1-2-4-3.

A. intake
B. exhaust
C. firing
D. power