A.laying a pipeline
B.dredging
C.mineclearing
D.not under command
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A.location
B.height of light above water
C.luminous range
D.light characteristics
A.fuel
B.electricity
C.oxygen
D.heat
A.every station in one chain to transmit at the same time
B.each station to transmit without reference to another station
C.on-line transmission of single-line transmitters at the same time
D.each station to only depend on the master for synchronization and signal ratio
A.the rotation of the earth on its axis
B.convection currents caused by differences in radiant heating between equatorial and polar regions
C.mountain ranges
D.All of the above
A.the letters ICW after the aid's number or letter
B.yellow stripes，squares，or triangles marked on them
C.white retroreflective material
D.the light characteristic and color for lighted aids
最新試題
An aneroid barometer on a boat should always be（）.
An engine compartment gasoline fire requires which type of extinguisher?（）
An example of a grade B product is（）.
An authorized light to assist in the identification of submarines operating on the surface is a(n)（）.
An inflatable liferaft is floating in its container，attached to the ship by its painter，as the ship is sinking rapidly. Which action should be taken with respect to the liferaft container? （）
An advantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it（）.
In handling break bulk hazardous materials，it is forbidden to use（）.
Explosive and flammable gasses are most likely to be encountered on a vessel（）.
An example of a grade C product is（）.
Aids to navigation marking the intracoastal waterway can be identified by（）.