單項(xiàng)選擇題（） unit is mounted so as to raise and lower the cable from the spurling pipe, which is at the top and center of the chain or cable locker.

A.The cable lifter
B.The hoisting motor
C.The topping wire
D.The life-raft


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2.單項(xiàng)選擇題Large pipes or down-comers are fitted between the steam drum and （） to ensure good natural circulation of water.

A.fire-tubes
B.furnaces
C.water drums
D.water wall tubes

3.單項(xiàng)選擇題With reference to a rotary vane steering gear system, which one of the following statements is true?（）

A.The three moving vanes and the three fixed vanes form three pressure chambers
B.The three moving vanes and the three fixed vanes form six pressure chambers
C.The three moving vanes and the three fixed vanes form nine pressure chambers
D.The three moving vanes and the three fixed vanes form twelve pressure chambers

4.單項(xiàng)選擇題With reference to rules governing steering gear, which one of the following rules is incorrect? （）

A.It is required that all ships are provided with two independent steering gear systems that is one main and one auxiliary
B.The auxiliary gear could be power operated in passenger ships
C.The auxiliary gear must be of adequate strength and sufficient to steer a ship at navigable speed
D.All moving parts of the steering gear must be guarded against any possible damage

5.單項(xiàng)選擇題With reference to operating a four-ram steering gear system under emergency conditions, which one of the following statements is incorrect?（）

A.Only one pump should be used at any time
B.The ship speed should be reduced to 70% of the normal
C.Watch keeping of the steering gear should be increased
D.Limitations of the steering gear should be logged but the bridge need not be informed