單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

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

單項(xiàng)選擇題

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