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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相关考题
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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 -
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
