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單項(xiàng)選擇題

The amount of fuel delivered by a unit injector is controlled by the （）

A.camshaft
B.main spring
C.rack position
D.nozzle orifice size

單項(xiàng)選擇題

Cast iron pistons used in large propulsion diesel engines are constructed with （）

A.not taper what so ever
B.the skirt being tapered and smaller than the crown
C.the skirt being tapered and larger than the crown
D.the crown being tapered and smaller than the skirt

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