单项选择题
A self-contained breathing apparatus is used to（）.
A.make underwater repairs to barges
B.determine if the air in a tank is safe for men
C.enter areas that may contain dangerous fumes or lack oxygen
D.resuacitate an unconscious person
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A set of interior steps on a ship leading up a deck from below is known as（）.
A.a companion way
B.tween-decks
C.stairs
D.Any of the above are acceptable -
单项选择题
A sheave is a（）.
A.grooved wheel in a block
B.line to hold a lifeboat next to the embarkation deck
C.partial load of grain
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A smooth, tapered pin, usually of wood, used to open up the strands of a rope for splicing is called a (n)（）.
A.batten
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