To obtain accuracy in fixing by DF，______ and three stations should be used．

试卷相关题目

• 1Calibration Stations give special transmissions for the calibration of ship's ______．

  A.gyro-compass

  B.marine radar

  C.DF

  D.navigational satellite

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• 2The system will accept a harbor map which is incorrect，therefore the operator must exercise caution in harbor selection．

  A.be considered

  B.be prudent

  C.be bold enough

  D.be carelessness

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• 3Your radar is set on a true motion display．Which of the following will NOT appear to moveacross the PPI scope、

  A.Echoes from a buoy

  B.Own ship's marker

  C.Echo from a ship on the same course at the same speed

  D.Echo from a ship on a reciprocal course at the same speed

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• 4The radio waves used for radar are very short，only ______ long．

  A.a few centimeters

  B.a few fathoms

  C.a few meters

  D.a few feet

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• 5Before sailing，mariners on duty shall check the headings of magnetic compass by comparison with ______．

  A.ship's clock

  B.engine movement recorder

  C.repeaters

  D.navigation lights

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• 6A compass card without north-seeking capability that is used for relative bearings is a(n) ______．

  A.bearing circle

  B.pelorus

  C.bearing bar

  D.alidade

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• 7Before switching on gyro-compass，you should make sure that the power supply on board is ______．

  A.high or low

  B.AC or DC

  C.strong or weak

  D.on or off

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• 8What is a requirement for any action taken to avoid collision、

  A.When in sight of another vessel，any action taken must be accompanied by sound signals

  B.The action taken must include changing the speed of the vessel

  C.The action must be positive and made in ample time

  D.All of the above

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• 9When two power-driven vessels are crossing，which vessel is the stand-on vessel、

  A.The vessel which is to starboard of the other vessel

  B.The vessel which is to port of the other vessel

  C.The larger vessel

  D.The vessel that sounds the first whistle signal

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• 10The rules require that a stand-on vessel SHALL take action to avoid collision when she determines that ______．

  A.risk of collision exists

  B.the other vessel will cross ahead of her

  C.the other vessel is not taking appropriate action

  D.collision cannot be avoided by the give-way vessel's maneuver alone

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