單項(xiàng)選擇題

The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.

A.An atomic time standard
B.Daylight Savings Time
C.Eastern Standard Time
D.Greenwich Mean Time

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

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

單項(xiàng)選擇題

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