单选题The points on the earth’s surface where the magnetic dip is 90° are（）.AAlong the magnetic equatorBConnected by the isoclinal lineCThe isoporsDThe magnetic poles
单选题
The points on the earth’s surface where the magnetic dip is 90° are（）.
A
Along the magnetic equator
B
Connected by the isoclinal line
C
The isopors
D
The magnetic poles
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