From ______ the mariner can know the data of tide．

试卷相关题目

• 1There shall be two principal ______ through the harbor for the passage of vessels．

  A.straits

  B.channels

  C.canals

  D.roadsteads

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• 2Information on shipping movements can be ______ by radio from Dover Port Control．

  A.got

  B.made

  C.obtained

  D.taken

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• 3A twin screw vessel，making headway with both engines turning ahead，will turn more readily to starboard if you ______.

  A.reverse port engine，apply right rudder

  B.reverse port engine，rudder amidships

  C.reverse starboard engine，apply right rudder

  D.reverse starboard engine，rudder amidships

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• 4In relation to the turning circle of a ship，the term advance means the distance ______.

  A.gained at right angles to the original course

  B.gained in the direction of the original course

  C.moved sidewise from the original course when the rudder is first put over

  D.around the circumference of the turning circle

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• 5A check rope is ______.

  A.a safety line attached to a man working over the side

  B.used to measure water depth

  C.used to slow the headway of a barge

  D.used to measure the overhead height of a bridge

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• 6Vessels in port may use ______ for receiving typhoon warnings during the typhoon season．

  A.their transmitters

  B.their receivers

  C.their radars

  D.their GPS

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• 7A wind vane on a moving vessel shows ______.

  A.dead reckoning wind direction

  B.true wind direction

  C.relative wind direction

  D.estimated wind direction

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• 8In the doldrums(赤道无风带) you can expect ______.

  A.steady，constant winds

  B.frequent rain showers and thunderstorms

  C.steep pressure gradients

  D.low relative humidity

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• 9A cloud sequence of cirrus，cirrostratus，and altostratus clouds followed by rain usually signifies the approach of a(n) ______.

  A.occluded front

  B.stationary front

  C.warm front

  D.cold front

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• 10When warm moist air is blown over a colder surface, ______ will happen.

  A.advection fog

  B.radiation fog

  C.dense fog

  D.steam fog

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