Navigational charts are subject to frequent changes，the important ones of which are promulgated by ______．

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• 1Attention is ______ the advice on the use of charts in The Mariner's Handbook Chapter 3，Section 1．

  A.fixed to

  B.needed for

  C.pushed to

  D.drawn to

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• 2On a chart，the characteristic of the light on a lighthouse is shown as flashing white with a red sector．The red sector ______．

  A.indicates the limits of the navigable channel

  B.indicates a danger area

  C.is used to identify the characteristics of the light

  D.serves no significant purpose

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• 3Mean high water is the average height of ______．

  A.the higher high waters

  B.the lower high waters

  C.the lower of the two daily tides

  D.all high waters

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• 4A line connecting all possible positions of your vessel at any given time is a ______．

  A.longitude line

  B.isogonic lines

  C.latitude line

  D.line of position

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• 5Admiralty Notices to Mariners，containing important information for the mariners and enabling them to keep their charts and books corrected for the latest information，are issued daily and published in ______．

  A.Weekly Editions

  B.Quarterly Editions

  C.Annual Editions

  D.Monthly Editions

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• 6Which statement is true of the Uniform Lateral System of Buoyage？

  A.It employs top marks

  B.Lighted buoys have the same shape as unlighted buoys

  C.The numbering or lettering of fairway buoys is optional

  D.All of the above

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• 7Chart legends which indicate a conspicuous landmark are printed in ______．

  A.capital letters

  B.italics

  C.boldface print

  D.underlined letters

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• 8A weather forecast states that the wind will commence backing．In the Northern Hemisphere(北半球), this would indicate that it will ______．

  A.shift in a clockwise manner

  B.decrease in velocity

  C.continue blowing from the same direction

  D.shift in a counterclockwise manner

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• 9The issue of Notices to Mariners of charts and these aids(Radar beacons)may be delayed until such time as they are assessed to be ______．

  A.temporary

  B.permanent

  C.occasional

  D.steady

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• 10______ chart 3994，positions read from this chart should be shifted 0．03 minutes Northward．

  A.To consider

  B.To check

  C.To examine

  D.To agree with

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