單項選擇題

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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單項選擇題

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

單項選擇題

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
D.the light characteristic and color for lighted aids

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All Loran-C transmitting stations are equipped with cesium frequency standards which permit （）.

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Air circulation is caused or affected by（）.

Aids to navigation marking the intracoastal waterway can be identified by（）.