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單項(xiàng)選擇題

The needle valve will open when the fuel pressure acting on the needle valve （） exerts a sufficient force to overcome the spring compression.

A.tape face
B.tapered face
C.surface
D.thinner face

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單項(xiàng)選擇題

The needle valve in the injector （） at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.

A.will lift
B.will be lifted
C.will close
D.will be closed

單項(xiàng)選擇題

The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.

A.be jammed
B.be opened
C.be seated
D.be broken