单项选择题
All Loran-C transmitting stations are equipped with cesium frequency standards which permit （）.
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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Air circulation is caused or affected by（）.
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 -
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Aids to navigation marking the intracoastal waterway can be identified by（）.
A.the letters ICW after the aid's number or letter
B.yellow stripes，squares，or triangles marked on them
C.white retroreflective material
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After you get underway，what is the first river gage you will pass? （）
A.Bayou Sara
B.Baton Rouge
C.Head of Passes
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