单项选择题
When crossing a front,isobars tend to（）.
A.change from smooth curves within the air mass to sharp bends at the front
B.change from sharp bends within the air mass to smooth curves at the front
C.pass smoothly across the front with no change
D.become closer together at the front and pass through in straight lines
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Details of coast radio stations and radar stations can be found in（）.
A.Admiralty Chart
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A.at high vessel speeds
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When compared to air temperature,which factor is most useful in predicting fog?（）
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