A.Non-toxic gas
B.oxygen
C.Hydrogen
D.Helium
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A.towing bridle
B.main weather cover
C.external lifelines
D.righting strap
A.turned off
B.already
C.almost
D.ready
A.M is not fixed at large angle
B.there is no M at large angles
C.G is not fixed at large angles
D.there is no G at large angles
A.good towing ground
B.good holding ground
C.good grabbing ground
D.good dragging ground
A.breaking the chain reaction
B.smothering the fire
C.cooling the fire
D.coating the fule with a nonflammable surface
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The circulation around a low pressure center in the Northern Hemisphere is（）.
The helm command PORT TWENTY means（）.
When the wave period and the apparent rolling period are the same（）.
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 mean draft of a ship is the draft（）.
Bales close to the deckhead should be covered to prevent（）.
In the Northern hemisphere northerly winds may cause temperature（）.
The dew point temperature is（）.
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（）.