A.should be worn while fighting a fire
B.can be used in atmosphere deficient in oxygen
C.filter contaminants from air that is to be breathed
D.may be substituted for a self-contained breathing apparatus
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A.settle near the bottom of the blige
B.settle near the top of the bilge
C.settle evenly throughout all levels of the bilge by mixing with air
D.disperse to atmosphere
A.sweep flames away with water spray
B.shut off the leak
C.use a chemical foam fire extinguisher
D.call t e local fire department
A.Non-toxic gas
B.oxygen
C.Hydrogen
D.Helium
A.towing bridle
B.main weather cover
C.external lifelines
D.righting strap
A.turned off
B.already
C.almost
D.ready
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Where would you find information about the time of high tide at a specific location on a particular day of the year?（）
Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.
Shipboard Emergency Drills must be carried out at least（）on board cargo ship.
（）is where the crew eat their meals.
It is dangerous for vessels without the operational radar（）the estuary.
Full details of all lights and fog signals are shown on（）.
The helm command PORT TWENTY means（）.
The dew point temperature is（）.
What is a CORRECT reply to a pilot’s request, How’s your heading?（）
In the Northern hemisphere northerly winds may cause temperature（）.