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

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• 1In 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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• 2A 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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• 3Vessels 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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• 4From ______ the mariner can know the data of tide．

  A.the Sea Pilot

  B.the Cargo Plan

  C.the Tide Table

  D.the Port List

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• 5There shall be two principal ______ through the harbor for the passage of vessels．

  A.straits

  B.channels

  C.canals

  D.roadsteads

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• 6When 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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• 7In 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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• 8The 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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• 9In 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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• 10On 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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