An uncontrolled flow of gas，oil，or other well fluids into the atmosphere is called a（）.

All the traces are（）old ones.

A.clear
B.evident
C.obvious
D.apparently

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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

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