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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Important changes to charts and lights（including temporary ones），radio signals and sailing directions are listed in（）.
Lines drawn through points on the Earth having the same atmospheric pressure are known as （）.
Before personnel are lifted from a vessel in a personnel basket，the vessel should be（）.
A vessel in distress should send by radio telephone the two tone alarm signal followed immediately by the（）.
The latest known details of lights are given in（）.
A sweep oar is an oar that is（）.
For details of these and other lights the larger scale charts and Admiralty Lists should be （）.
After being launched from a vessel，totally enclosed survival craft which have been afloat over a long period require（）.
An orange flag showing a black circle and square is a（）.
The information on ocean voyage planning with routeing details for powered and sailing vessels is likely found in（）.