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

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  A . capital letters B . italics C . boldface print D . underlined letter

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• Periodic publications notifying changes in，or additions to，previously published navigational data are（）.

  A . Supplements B . Annual Summary C . Navigational Warnings D . Notices to Mariner

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• （）is normally responsible for maintaining records of corrections to navigational charts and nautical publications.

  A、The Chief Officer B、The Second Officer C、The Third Officer D、The PSC Officer

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• The charts sold are of （）.

  A、newly edition with up to date correction and in reasonable prices. B、the current edition and incorporate the latest Notices to Mariners correction at the time of sale. C、the current edition and incorporate the last Notices to Mariners correction D、brand-new one with up to date correction and clean writing

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• Admiralty Charts are published in （）.

  A . U.S.A B . China C . U.K D . Japa

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• Isobars on a synoptic chart are useful in predicting（）.

  A . temperature B . dew point C . wind velocity D . relative humidity

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• Top and inner graduated borderlines of the chart are（）.

  A . scales of latitude B . scales of longitude C . compass rose D . source data

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• Charted depths are decreased（）2 meters．

  A . in B . on C . with D . by

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• There are many navigational aids（）.

  A . in chief engineer's room B . in chief officer's room C . on the bridge D . on deck

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• Charts are subject to frequent correction according to （）.

  A、Notices to Mariners B、Mariner's handbook C、Sailing Directions D、Guide to Port Entry

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• On this chart only the principle （） to navigation are shown．

  A . equipment's B . tools C . apparatus D . aid

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• There are still（）charts to be corrected.

  A . few B . a few C . little D . a little

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• （）are published for the correction of Admiralty Charts．

  A . Admiralty Sailing Directions B . Admiralty List of Signals C . Mariner's Handbook D . Admiralty Notices to Mariner

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• The soundings on the imperial chart are measured in（）.

  A . Feet B . Yards C . Fathoms D . Meter

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• Many navigational warnings are of a temporary nature，but others remain in force for several months or may be succeeded by（）.

  A . Notices to Mariners B . Sailing Directions C . List of Lights and Signals D . Guide to Port Entrie

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• Isogonic lines are lines on a chart indicating （）.

  A . points of equal variation B . points of zero variation C . the magnetic latitude D . magnetic di

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

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