单项选择题

Generally speaking，the most favorable bottom for anchoring is（）.

A.Very soft mud
B.Rocky
C.A mixture of mud and clay
D.Loose sand

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单项选择题

A.All required documents and publications may have to be produced
B.Licensed GMDSS radio operators may be required to demonstrate equipment competencies
C.All required equipment must be fully operational
D.All of the above

单项选择题

Downwind for 1 miles，alter to starboard 90 degrees，go down this course for 1 mile；Then alter 90 degrees to starboard and go down this course for 2 miles；Then alter 90 degrees to starboard and go down this course for 2 miles；Keep adding 1 mile ever time you alter to starboard．This operation is（）search pattern

A.Williamson Turn
B.Parallel
C.Sector
D.Expanded

单项选择题

Course directed by the OSC or CSS to be steered at the beginning of a search is（）.

A.original course
B.initial course
C.final course
D.designated course