题目内容

EFI supplies an accurate air/fuel _____ to the engine no matter what operating conditions are encountered.

A. proportion
B. scale
C. ratio
D. number

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By delivering fuel directly at the back of the intake valve, the intake_____ design can be optimized to improve air velocity at the intake valve.

A. pipe
B. port
C. manifold
D. hose

The______ spark is generated outside the engine.

A. electric
B. eleven
C. excuse
D. electrical

Injecting the fuel______ in relation to the movement of the crankshaft.

A. at the right time
B. at the same time
C. in time
D. by time

The EFI system does not rely on any major adjustments for cold enrichment or fuel metering. Because the system is mechanically simple ,maintenance requirements are _______.

A. fortified
B. augmented
C. added
D. reduced