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 Loran-C transmitting stations are equipped with cesium frequency standards which permit （）.
All portable fire extinguishers must be capable of being（）.
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 all-round flashing yellow light may be exhibited by a(n)（）.
AMVER is a system which provides（）.
Antiseptics are used principally to（）.
An advantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it（）.
An advantage of the Christmas Tree towing method is to（）.
An “ABC” dry chemical fire extinguisher would be LEAST effective against a fire in（）.
An “on-load” release system on a survival craft means the cable can be released（）.