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（）.
The height of a tide can be increased by（）.
Information for updating nautical charts is primarily found in the（）.
（）is the system for the broadcast and automatic reception of maritime safety information by means of narrow-band direct-printing telegraphy.
Weekly Notices are dated for the（）appropriate to the week they are issued on the UKHO website.
The fog most commonly encountered at sea is called（）.
For what purpose would using a Lambert conformal chart be more convenient than using a Mercator?（）
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（）.
On the approach of a warm front the barometric pressure usually（）.