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 advantage of the Christmas Tree towing method is to（）.
An example of a grade B product is（）.
An airplane should NOT send which signal in reply to a surface craft?（）
An icebreaker displaying a flag hoist which consists of the code letters “WO” (Whiskey Oscar) is indicating that（）.
Antiseptics are used principally to（）.
All of the following are part of the fire triangle EXCEPT（）.
Explosive and flammable gasses are most likely to be encountered on a vessel（）.
An all-round flashing yellow light may be exhibited by a(n)（）.
All portable fire extinguishers must be capable of being（）.
An advantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it（）.