A.plane tangent at one point
B.cylinder tangent at one parallel
C.cone tangent at one parallel
D.series of cones tangent at selected parallels
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A.when at anchor
B.only when making way
C.at any time when underway
D.only when the identifying lights are not being shown
A.aground
B.at anchor
C.not under command
D.being towed
A.average wind conditions
B.tidal currents
C.magnetic variation
D.average limits of field ice
A.B flammable liquid
B.C flammable liquid
C.D combustible liquid
D.E combustible liquid
A.should always be immediately corrected
B.will always cause a vessel to capsize
C.always results from off-center weights
D.All of the above are correct
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Mariners not entering the port are（）to keep at least one mile off.
What is the use of the books of Admiralty List of Lights and Fog Signals? Their use is to （）.
The latest known details of lights are given in（）.
Before personnel are lifted from a vessel in a personnel basket，the vessel should be（）.
Lines drawn through points on the Earth having the same atmospheric pressure are known as （）.
An inflatable liferaft is hand-launched by（）.
The international number，location and/or name，geographical co-ordinates，characteristics and intensity，elevation in metres，range in sea miles and description of structure of a light can be found in（）.
The Lists of Meteorological Observation Stations can be found in（）.
Aboard a survival craft，ether can be used to（）.
The program of graphical predictions of height against time for a period of up to seven consecutive days is contained in（）.