单项选择题
Can you tell me something about the tallying methods at your port?（）.
A.Certain
B.Be certain
C.Sure
D.Be sure
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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
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As a general rule，tally clerks should make their tallying（）.
A.in warehouses
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After being launched from a vessel，totally enclosed survival craft which have been afloat over a long period require（）.
A.frequent opening of hatches to permit entry of fresh air
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C.use of ear plugs to dampen engine noise
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