A.circle of equal altitude
B.parallel of declination
C.parallel of altitude
D.vertical circle
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A.straight line
B.arc
C.parabola
D.hyperbola
A.all-round yellow light only
B.all-round white light only
C.all-round blue light only
D.alternating red and yellow light
A.I am in doubt as to your actions
B.My engines are full speed astern
C.I desire to overtake you
D.I am operating astern propulsion
A.should be righted by standing on the carbon dioxide cylinder，holding the righting straps and leaning backwards
B.should be righted by standing on the life line，holding the righting straps leaning backwards
C.will right itself when the canopy tube inflates
D.must be cleared of the buoyant equipment before it will right itself
A.at the bow
B.at the stern
C.in the middle
D.all around
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A sweep oar is an oar that is（）.
Mariners not entering the port are（）to keep at least one mile off.
After being launched from a vessel，totally enclosed survival craft which have been afloat over a long period require（）.
The program of graphical predictions of height against time for a period of up to seven consecutive days is contained in（）.
To predict the actual depth of water using the Tide Tables，the number obtained from the Tide Tables is（）.
Admiralty EasyTide（）.
The latest known details of lights are given in（）.
The Lists of Meteorological Observation Stations can be found in（）.
A vessel in distress should send by radio telephone the two tone alarm signal followed immediately by the（）.
The information on（）is not likely found in The Mariners Handbook.