Which statement is TRUE of a stiff vessel、

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• 1On 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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• 2On small scale charts of ocean areas where hydrographic information is，in many cases，still ______ ，charted shoals may be in error as regards position，depth and extent．

  A.spare

  B.spade

  C.sparse

  D.spear

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• 3In revised editions of Admiralty charts the ______ are corrected first．

  A.smaller scales

  B.larger scales

  C.smaller scales and larger scales

  D.moderate scales

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• 4The Admiralty Notices to Mariners can be obtained ______ by Masters of vessels from any Admiralty Chart Agent．

  A.free of charge

  B.with no responsibility

  C.without limitations of distribution

  D.with little charges

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• 5In Beaufort Scale，the wind force 7 with speed of 28-33 knots is defined as ______ .

  A.Moderate gale

  B.Near gale

  C.Strong gale

  D.Whole gale

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• 6For details of these and other lights the larger scale charts and Admiralty Lists should be ______ .

  A.considered

  B.consulted

  C.concluded

  D.commanded

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• 7Coast Pilots and navigational charts are kept corrected and up-to-date by using the ______.

  A.pilot charts

  B.Notices to Mariners

  C.Tide Tables

  D.Current Tables

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• 8The 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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• 9In which voyage，between two points，is the rhumb line distance NOT approximately the same as the great circle distance、 ______.

  A.The two points are in low latitudes in the same hemisphere

  B.The two points are in high latitudes in the same hemisphere

  C.The two points are near the equator，but in different hemispheres

  D.One point is near the equator，one point is in a high latitude，and both are near the 180th meridian

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• 10A tide is called diurnal when ______.

  A.only one high and one low water occur during a lunar day

  B.the high tide is higher and the low tide is lower than usual

  C.the high tide and low tide are exactly six hours apart

  D.two high tides occur during a lunar day

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