Many of the soundings shown on the chart are______inadequate and often very poor surveys .Undue reliance should not be placed upon them.A.drived fromB.derived byC.derived fromD.drived by

Many of the soundings shown on the chart are______inadequate and often very poor surveys .Undue reliance should not be placed upon them.

A.drived from

B.derived by

C.derived from

D.drived by


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Many of the soundings shown on the chart are derived from ______.Undue reliance should not be placed upon them.A.complete and often very poor surveysB.correct and often very good surveysC.inadequate and often very old surveysD.adequate and present surveys

The heights and soundings of Admiralty chart are expressed ______ in Fathoms ______ in Meters.A.either,orB.neither,norC.another,norD.other,or

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单选题Many of the soundings shown on the chart are derived from ().Undue reliance should not be placed upon them.Acomplete and often very poor surveysBcorrect and often very good surveysCinadequate and often very old surveysDadequate and present surveys

单选题In very high latitudes,the most practical chart projection is the().AMercatorBGnomonicCAzimuthalDLambert conformal

单选题How is the annual rate of change for magnetic variation shown on a pilot chart?()AGray lines on the uppermost inset chartBRed lines on the main body of the chartCIn parenthesis on the lines of equal magnetic variationDAnnual rate of change is not shown

单选题The soundings on the chart are based on the depth of water available at ().Amean low waterBmean lower low waterCmean high waterDmean high water springs

单选题Owing to old data of the survey the positions and number of the beacons shown on this chart are not to be ().AconsideredBinsuredCrelied uponDsuspected

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