A.when you obtain an estimated position
B.only in piloting waters
C.at every speed change
D.All of the above are correct
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A.every fix or running fix
B.every course change
C.every speed change
D.All of the above are correct
A.nitrogen
B.oxygen
C.sodium
D.carbon dioxide
A.to alter
B.alter
C.altering
D.altered
A.chemical protection face shield
B.approved work vest
C.self-contained breathing apparatus
D.marlinspike
A.Broaching
B.Fish tailing
C.Squatting
D.Parallel sinkage
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（）is where the crew eat their meals.
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Before any loading takes place any signs of the previous cargo should do（）.
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Full details of all lights and fog signals are shown on（）.
The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.