A.Plotting radio bearings over a long distance
B.Determining latitude and longitude of a fix
C.Measuring rhumb line distances
D.Measuring rhumb line directions
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A.warm front at night
B.low pressure area
C.anticyclone
D.lack of frontal activity
A.in
B.on
C.with
D.by
A.is decreased
B.decreased
C.decreases
D.are decreased
A.vertical distance from the tidal datum to the ocean bottom plus the height of the tide
B.vertical distance from the tidal datum to the ocean bottom
C.average height of water over a specified period of time
D.average height of all low waters at a place
A.capital letters
B.italics
C.boldface print
D.underlined letters
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On the high seas，a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a（）.
Which would influence a magnetic compass（）.
The fog most commonly encountered at sea is called（）.
The best estimate of the wind direction at sea level can be obtained from observing the direction of the（）.
Information for updating nautical charts is primarily found in the（）.
In revised editions of Admiralty charts the（）are corrected first．
The broken magenta line which runs parallel to the shorebetween Roanoke Point and Mattituck Inlet marks a（）.
For what purpose would using a Lambert conformal chart be more convenient than using a Mercator?（）
（）is the system for the broadcast and automatic reception of maritime safety information by means of narrow-band direct-printing telegraphy.
Why is a warning sign displayed at the gangway or access point of a barge during cargo transfer（）.