One of the principal dangers inherent in liquefied petroleum gas is that ______．

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• 1A radio medical advice service ______ ships of all nationalities and no charge is made for this service．

  A.is available to

  B.is available for

  C.are available to

  D.are available for

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• 2In 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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• 3No navigational aids are shown and chart is not kept corrected for alterations in depths inside the pecked lines．For more detailed information，the larger scale charts must be ______．

  A.bought

  B.analyzed

  C.consulted

  D.published

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• 4A shipper of cargo aboard your vessel offers a letter of indemnity for the cargo．This is done in order to obtain a(n) ______．

  A.clean Bill of Lading

  B.order Bill of Lading

  C.straight Bill of Lading

  D.through Bill of Lading

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• 5MAINLY GOOD BECOMING MODERATE．This forecast probably refers to ______ in a certain area．

  A.visibility

  B.winds

  C.sea

  D.fog

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• 6Sailing directions are kept up to date by ______．

  A.publications

  B.notices to mariners

  C.supplements

  D.Annual Summary of Admiralty Notices to Mariners

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• 7All events relating to navigation，such as ship's position，speed and details of the weather，are recorded in ______．

  A.Logbook

  B.Bell Book

  C.Oil Record Book

  D.Compass Error Book

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• 8A chart has extensive corrections to be made to it. When these are made and the chart is again printed，the chart issue is a _______.

  A.first edition

  B.new edition

  C.revised edition

  D.reprint

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• 9Deviation is the angle between the ______．

  A.true meridian and the axis of the compass card

  B.true meridian and the magnetic meridian

  C.magnetic meridian and the axis of the compass card

  D.axis of the compass card and the degaussing meridian

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• 10In which voyage，between two points，is the rhumb line distance NOT approximately the sameas 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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