A.in
B.on
C.with
D.by
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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
A.conspicuous
B.inconspicuous
C.a government facility or station
D.a radio transmitter
A.does not change
B.improves rapidly
C.improves only slightly
D.becomes poor
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Why is a warning sign displayed at the gangway or access point of a barge during cargo transfer（）.
The fog most commonly encountered at sea is called（）.
On the high seas，a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a（）.
The best estimate of the wind direction at sea level can be obtained from observing the direction of the（）.
Steam smoke will occur when（）.
The broken magenta line which runs parallel to the shorebetween Roanoke Point and Mattituck Inlet marks a（）.
The range of a light on Admiralty Charts is normally the（）.
On a nautical chart，the inner ring of a compass rose indicates（）.
Navigational warnings are published according to（）.
What is the significance of the broken magenta lines which roughly parallel the shore between Roanoke Point and Orient Point on Long Island（）.