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單項選擇題

On the approach of a warm front the barometric pressure usually（）.

A.falls
B.rises
C.is steady
D.is unreliable

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單項選擇題

On a nautical chart，the inner ring of a compass rose indicates（）.

A.true directions
B.compass error
C.deviation
D.magnetic directions

單項選擇題

Navigational warnings are published according to（）.

A.the designed area
B.the designated area
C.the indicated area
D.all area over the world