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
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
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The heights and soundings of Admiralty chart are expressed ______ in Fathoms ______ in Meters．A.either，orB.neither，norC.another，norD.other，or
Owing to old data of the survey the positions and number of the beacons shown on this chart are not to be ______.A.consideredB.insuredC.relied uponD.suspected
In very high latitudes，the most practical chart projection is the ______．A.MercatorB.GnomonicC.AzimuthalD.Lambert conformal
In what units are heights and soundings in the chart? They are in ______.A.meters and fathomsB.fathoms and metersC.meter and fathomD.fathom and meter
单选题The heights and soundings of Admiralty chart are expressed（）in Fathoms（）in Meters．A either，orB neither，norC another，norD other，or
单选题On this chart only the principle （） to navigation are shown．A equipment'sB toolsC apparatusD aids
