单项选择题

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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单项选择题

As a general rule，tally clerks should make their tallying（）.

A.in warehouses
B.on deck
C.ashore
D.in the tallyroom

单项选择题

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
B.regular checks of bilge levels
C.use of ear plugs to dampen engine noise
D.frequent flushing of the water spray system with fresh water