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單項(xiàng)選擇題The rising velocity of the globules carries them upwards where they become trapped by the under surfaces of plates and （）until the enlarged globules have sufficient rising velocity to travel along the plate surface and break away at periphery.

A.disperse
B.coalesce
C.compress
D.shrinkage

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1.單項(xiàng)選擇題Humans are still needed to monitor the condition of the boiler all the time the latter is operated, （）it is just to acknowledge an alarm buzzer or flashing light in a control room.

A.even if
B.so that
C.such that
D.in order that

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2.單項(xiàng)選擇題The steam boiler is part of a closed loop steam, whereby, after the energy of the steam is used up and it becomes water again, （） is collected and returned back to the boiler for heating up again to steam.

A.the former
B.the first
C.the latter
D.the last

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3.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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4.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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5.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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