单项选择题

Vessels in port may use（）for receiving typhoon warnings during the typhoon season.

A.their transmitters
B.their receivers
C.their radars
D.their lorans

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单项选择题

We’ll see（）the compasses are in good condition.

A.if
B.how
C.when
D.where

单项选择题

More exact assessment of visibility when（）is used to determine the range of vessel or other objects in the vicinity.

A.radar
B.omega
C.satellite navigator
D.DF

单项选择题

Which statement about satellite navigation is TRUE? （）

A.While a fix can be generated by signals received from two satellites，three satellites are necessary for reliable accuracy
B.The satellites are in equatorial orbits around the earth about 60°of longitude apart
C.The satellite navigation system determines a fix by measuring the doppler shift of the radio signals from the satellite
D.The ship's receiver cannot begin processing data until the antenna locks onto the satellite and starts continuous tracking