题目内容

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

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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

Any fuel that is not delivered to the ____manifold by the injector is returned to the tank through a fuel return pipe.

A. closed
B. open
C. exhaust
D. intake