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单选题
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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单选题When crossing a front,isobars tend to（）.A
change from smooth curves within the air mass to sharp bends at the frontB
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