单项选择题

The operator of the ship’s radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a（）.

A.Mate's license
B.Restricted radiotelephone operator permit
C.Second-class radio operator's license
D.Seaman's document

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单项选择题
The operation of which aids to navigation may be suspended during war or national emergency（）.

A.Navigational satellites
B.Loran
C.Omega
D.Any of the above
单项选择题
The loran lines drawn on navigation charts represent（）.

A.Ground waves
B.Skywaves
C.Either ground waves or skywaves interchangeably
D.An average between ground wave and skywave positions
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