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
All of the following vessels are “restricted in their ability to maneuver” EXCEPT a vessel （）.
An all-round flashing yellow light may be exhibited by a(n)（）.
An entry of water，gas，oil，or other formation fluid into the wellbore is called a（）.
An example of a grade B product is（）.
An advantage of the Christmas Tree towing method is to（）.
Explosive and flammable gasses are most likely to be encountered on a vessel（）.
An azimuth angle for a body is measured from the（）.
An advantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it（）.
All OSV personnel should be familiar with survival craft（）.