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單項(xiàng)選擇題Care must be taken to condition the （）in the boiler to prevent scaling, and corrosion, which can weaken the pressure vessel.

A.water
B.fuel
C.steam
D.air

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1.單項(xiàng)選擇題The power and torque capability of the steering system must be such that the rudder can be swung from （）one side to（）the other side with the ship at maximum speed.

A.35°；35°
B.35°；30°
C.15°；15°
D.28°；60°

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2.單項(xiàng)選擇題Certain requirements must currently be met by a ship’s steering system.There must be （）independent means of steering, although where two identical power units are provided, an auxiliary unit is not required.

A.one
B.two
C.three
D.four

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3.單項(xiàng)選擇題In the variable delivery pump, moving the spindle more from the central point will cause （） fluid to be pumped and consequently （）pressure is generated to drive the rams.

A.more；more
B.more；less
C.less；more
D.less；less

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4.單項(xiàng)選擇題The required rudder angle is transmitted hydraulically or electrically from the steering wheel at the bridge to the （）at the steering gear, just above the rudder.

A.transmitter
B.tele-motor
C.hydraulic ram
D.hydraulic cylinder

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5.單項(xiàng)選擇題The transmission system is the means （）the movement of the rudder is accomplished.

A.by which
B.to which
C.in which
D.at which

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