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單項選擇題Special thrust devices are provided on ships to improve their （） at zero ship speed when the rudder is relatively ineffective.

A.brake capabilities
B.reversing capabilities
C.maneuvering capabilities
D.acceleration capabilities

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1.單項選擇題The auxiliary steering gear must be capable of being brought speedily into operation and be able to put the rudder over from 15 degrees on one side to 15 degrees on the other side in no more than （） with the ship at its deepest service draught and running ahead at the greater of one half of the maximum service speed or （）.

A.28 seconds；7 knots
B.28 seconds；14 knots
C.60 seconds；7 knots
D.60 seconds；14 knots

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2.單項選擇題The main steering gear must be able to steer the ship at maximum ahead service speed and be capable at this speed, and at the ships deepest service draught, of putting the rudder from 35 degrees on one side to 30 degrees on the other side within no （）.

A.more than 28 seconds
B.more than 60 seconds
C.less than 28 seconds
D.less than 60 seconds

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3.單項選擇題Which of the following chemicals will be used where protection against caustic cracking is required in boiler treatment?（）

A.Sodium hydroxide
B.Sodium carbonate
C.Sodium nitrate
D.Sodium polyphosphate

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4.單項選擇題Coalescence is the breakdown of surface tension between oil droplets in an oil/water mixture, which causes them to join and （） in size.

A.expand
B.extract
C.increase
D.decrease

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5.單項選擇題When in operation, it is unavoidable that a small amount of oil （） through leakage, and in order to compensate for these leaks the system is connected to a feed pump.

A.escapes
B.overheats
C.expands
D.accelerates

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