单项选择题

RESULT OF SEARCH NEGATIVE means（）.

A.the search has found nothing
B.the derelict has been found
C.the derelict has been located
D.the derelict has been sighted

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单项选择题
One of the signals，other than a distress signal，that can be used by a vessel to attract attention is a(n)（）.

A.red star shell
B.searchlight
C.burning barrel
D.orange smoke signal
单项选择题
Generally，you can best keep a vessel under steering control when the vessel has（）.

A.headway
B.sternway
C.no way on，with engines stopped
D.no way on，with engines full ahead
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