A.must be wet before it will release
B.should be kept in a watertight except in an emergency
C.will inflate the raft in its cradle if operaterd manually
D.must be submerged to a certain depth to release automatically
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A.the absolute temperature
B.atmospheric pressure
C.wind velocity
D.relative humidity
A.dry chemical
B.foam
C.high-velocity fog
D.water
A.at the bow
B.at the stern
C.in the middle
D.all around
A.should be righted by standing on the carbon dioxide cylinder, holding the righting straps, and leaning backwards
B.should be righted by standing on the life line, holding the righting straps, and leaning backwards
C.will right itself when the canopy tubes inflate
D.must be cleared of the buoyant equipment before it will right itself
A.minerals management service
B.Department of energy
C.corps of engineers
D.a recognized classification socitey approved
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Shipboard Emergency Drills must be carried out at least（）on board cargo ship.
ECDIS must be able to perform all of the following EXCEPT（）.
Full details of all lights and fog signals are shown on（）.
（）is on the panel of radar.
When the wave period and the apparent rolling period are the same（）.
Fog is likely to occur when there is little difference between the dew point and the（）.
The dew point temperature is（）.
It is dangerous for vessels without the operational radar（）the estuary.
A tide is called diurnal when（）.
When steering by autopilot,how often should the steering be checked?（）