單項(xiàng)選擇題In conventional systems, the injection pressure(), while it’s()in common rail diesel engines.

A.fluctuates with the engine speed to some extent, independent of the engine speed
B.keeps constant at all engine speed, dependent on the engine speed to some extent
C.keeps constant at all engine speed, independent of the engine speed
D.is decided by the engine speed, constant at all engine speed


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1.單項(xiàng)選擇題The difference between Fixed pitch propeller (FPP) and Controllable pitch propeller (CPP) is in that()

A.for FP, once fitted, the position of the blades can also be changed in operation
B.for CP, once fitted, the position of the blades can also be changed in operation
C.the CP type has a relatively smaller hub compared with the FP propellers
D.the FP type has a relatively larger hub compared with the CP propellers

4.單項(xiàng)選擇題()is used to prevent the entry of sea water to the machinery space.

A.A special sealing gland
B.Propeller
C.Tailshaft
D.Sterntube bearing

5.單項(xiàng)選擇題The thrust from the propeller to the hull of the ship is transferred by()

A.tie rod
B.thrust block
C.bedplate of main engine
D.frame of main engine

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