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單項(xiàng)選擇題

The fuel injector pump is operated by （） which drives the plunger up and down.

A.a separate motor
B.a cam
C.a generator
D.a chain

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單項(xiàng)選擇題

The fuel injector injects a fine spray of fuel into the hot air and combustion （）, producing much high pressure in the gases.

A.has begun
B.takes place
C.occurs
D.happens

單項(xiàng)選擇題

The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.

A.the cylinder head
B.the cross-head
C.the moving piston
D.the stationary piston

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