单项选择题

The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．

A.one
B.two
C.three
D.four

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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
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
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