A.complete and often very poor surveys
B.correct and often very good surveys
C.inadequate and often very old surveys
D.adequate and present surveys
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A.equipment's
B.tools
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A.with
B.in
C.by
D.to
最新試題
The broken magenta lines（long and short dashes）in and around Mobjack Bay indicate（）.
The shoreline on charts generally represents the mean（）.
When a buoy is in position only during a certain period of the year，where may the dates when the buoy is in position be found?（）
A chart position enclosed by a square is a（n）（）.
The short-long dashed magenta line around Gardiners Island marks（）.
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
The survey information upon which a chart is based is found （）.
Which chart symbol indicates the bottom is clay（）.
What defines a great circle? （）
What is NOT an advantage of the rhumb line track over a great circle track? （）