单项选择题
A.flow B.breakout C.kick D.blowout
All the traces are（）old ones.A.clearB.evidentC.obviousD...
单项选择题All the traces are（）old ones.
A.clear B.evident C.obvious D.apparently
A man was sighted as he fell overboard. After completin...
单项选择题A man was sighted as he fell overboard. After completing a Williamson turn，the man is not sighted. What type of search should be conducted?（）
A.Expanding circle B.Sector search C.Parallel track pattern D.Datum-drift search
（）the visibility to reduce to one mile by heavy rain，it...
单项选择题（）the visibility to reduce to one mile by heavy rain，it（）be impossible to rescue the vessel in distress.
A.Was／would B.Were／would C.Is／will D.Is／is to
