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 azimuth angle for a body is measured from the（）.
An “ABC” dry chemical fire extinguisher would be LEAST effective against a fire in（）.
All of the following vessels are “restricted in their ability to maneuver” EXCEPT a vessel （）.
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? （）
Air circulation is caused or affected by（）.
An engine compartment gasoline fire requires which type of extinguisher?（）
An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes? （）
An advantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it（）.
An “atoll cloud” forming over an island due to heating of the land during the daytime would be which type? （）
An example of an anchor which has a stock is a（）.