When crossing a front,isobars tend to（）.<br>A:change from smooth curves within the air mass to sharp bends at the front<br>B:change from sharp bends within the air mass to smooth curves at the front<br>C:pass smoothly across the front with no change<br>D:become closer together at the front and pass through in straight lines

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

出自：海船船员证

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