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單項選擇題

Radar bandwidth is normally（）to the range scale and the associated pulse length.

A.fixed
B.matched
C.fitted
D.equal

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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

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

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