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
C.apparatus
D.aids
A.with
B.in
C.by
D.to
最新試題
The numeral in the center of a wind rose circle on a pilot chart indicates the （）.
On chart，bearings to near objects should be used in preference to objects farther off，because（）.
The description Racon beside an illustration on a chart would mean a （）.
When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
The only cylindrical chart projection widely used for navigation is the （）.
Which aid is NOT marked on a chart with a magenta circle? （）
On a Mercator chart，1 nautical mile is equal to（）.
What defines a great circle? （）
The soundings on the imperial chart are measured in（）.
The broken magenta lines（long and short dashes）in and around Mobjack Bay indicate（）.