單項(xiàng)選擇題Excessively warm water leaving condenser may be caused by（）

A.fouled tubes in shell and tube condenser
B.too little or too warm condenser water
C.air or non-condensable gas in system
D.overcharge of refrigerant


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1.單項(xiàng)選擇題（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A.The winch motor
B.The band brake
C.The winch barrel
D.The anchor capstan

2.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

4.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

5.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