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.a companion way
B.tween-decks
C.stairs
D.Any of the above are acceptable
A.grooved wheel in a block
B.line to hold a lifeboat next to the embarkation deck
C.partial load of grain
D.sesman's knife
A.batten
B.bench hook
C.stabilizers
D.fid
A.trippers
B.stocks
C.awl
D.palms
A.keeps sparks from falling into an open tank
B.secures covers on ullage openings
C.prevents sparks from getting out of an enging's exhaust system
D.grounds static electicity
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（）is on the panel of radar.
Before any loading takes place any signs of the previous cargo should do（）.
（）is halfway between the forward and after perpendiculars and is reference point for vessel construction.
The ISM code is part of（）.
When the wave period and the apparent rolling period are the same（）.
The helm command PORT TWENTY means（）.
The mean draft of a ship is the draft（）.
Where would you find information about the time of high tide at a specific location on a particular day of the year?（）
Full details of all lights and fog signals are shown on（）.
The dew point temperature is（）.