题目内容

The intake stroke ______ at top dead centre with the intake valve open and the exhaust valve closed.

A. ends
B. commences
C. terminates
D. concluded

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The piston moves _____to draw a charge of air-fuel mixture into the cylinder through the open intake port.

A. upwards
B. downwards
C. forwards
D. retreats

The mixture of air and ______fuel is provided by the fuel injection system.

A. vaporized
B. vapor
C. vaporize
D. vaporing

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