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
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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
A.Bayou Sara
B.Baton Rouge
C.Head of Passes
D.Red River Landing
A.Thimble Shoal Main Channel or the South Auxiliary Channel
B.Any of the channels but keep to the right hand side
C.The South Auxiliary Channel
D.Thimble Shoal Main Channel
A.Any span is navigable
B.Northbank or Southbank
C.Southbank span only
D.Northbank span only
最新試題
An icebreaker assisting a vessel through an ice field would display a visual signal consisting of the code letter “E” (Echo) to signify that “（）”.
An “ABC” dry chemical fire extinguisher would be LEAST effective against a fire in（）.
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? （）
Aids to navigation marking the intracoastal waterway can be identified by（）.
Antiseptics are used principally to（）.
An anchored vessel is servicing an aid to navigation and is restricted in her ability to maneuver. Which lights will she show? （）
All of the following information concerning lighted aids to navigation may be read directly from the Light List EXCEPT the（）.
An icebreaker may use the code letter “K” to remind ships of their obligation to listen continuously on their radio. This signal may be made by any of the following EXCEPT（）.
An aneroid barometer on a boat should always be（）.
Explosive and flammable gasses are most likely to be encountered on a vessel（）.