单项选择题
A pilot vessel may continue to sound an identity signal if she is （）.
A.aground
B.at anchor
C.not under command
D.being towed
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A pilot chart does NOT contain information about （）.
A.average wind conditions
B.tidal currents
C.magnetic variation
D.average limits of field ice -
单项选择题
A petroleum liquid has a flash point of 85°F. This is a grade （）.
A.B flammable liquid
B.C flammable liquid
C.D combustible liquid
D.E combustible liquid -
单项选择题
A negative metacentric height （）.
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
