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

试卷相关题目

• 1Before 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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• 2It may be found that，in certain circumstances，Radar Beacon can cause unwanted interference particularly ______．

  A.at close range

  B.at end on situation

  C.at head on situation

  D.at crossing situation

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• 3On no account can they cut it ______ it be fouled．

  A.would

  B.shall

  C.should

  D.do

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• 4Which of the following statement is correct regarding ship handling when in the vicinity of traffic separation schemes？______．(1)A vessel shall，so far as practicable，avoid crossing traffic lanes (2)If obliged to cross traffic lanes，she shall do so as nearly as practicable at right angles to the general direction of traffic flow．

  A.(1) only

  B.(2) only

  C.Both(1) and (2)

  D.Neither (1) nor (2)

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• 5You may find the time of slack water after low water in a certain port from ______．

  A.Deadweight Scale

  B.Tide Tables

  C.Notices to Mariners

  D.Table of Azimuth

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• 6Your 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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• 7The 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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• 8Calibration 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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• 9To obtain accuracy in fixing by DF，______ and three stations should be used．

  A.parallel bearings

  B.long-range bearings

  C.short-range bearings

  D.cross bearings

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• 10A 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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