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單項選擇題

A rectangular area is described in degrees of latitude and longitude from the latitude and longitude of the southwest corner of（）.

A.square
B.triangle
C.circle
D.rectangle

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單項選擇題

Vessel in distress（）indicate their position by any method.

A.cannot
B.are not allowed
C.have the right
D.should get permission to

單項選擇題

The list of Coast Stations is republished（）in a trilingual.

A.every two years
B.every three years
C.every year
D.every four years