單項(xiàng)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(xiàng)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(xiàng)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