单选题By day，the horizontal motion of a white flag，or arms extended horizontally，by a person on the beach indicates（）.AHaul awayBTail block is made fastCNegativeDAffirmative
单选题
By day，the horizontal motion of a white flag，or arms extended horizontally，by a person on the beach indicates（）.
A
Haul away
B
Tail block is made fast
C
Negative
D
Affirmative
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