挑战习题
1/5单选题
难度:

1.

有关地磁场,下列说法正确的是(  )


A

指南针总指南北,是因为受到了地磁场的作用

B

地磁两极与地理两极完全重合

C

地球周围的地磁场的磁感线是从地磁南极出发到地磁北极

D

我国宋代学者沈括正确找到了地磁场产生的原因

提示1:
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提示2:
PHA+5Zyw56OB55qE5YyX5p6B5Zyo5Zyw55CG55qE5Y2X5p6B6ZmE6L+R77yM5Zyw56OB55qE5Y2X5p6B5Zyo5Zyw55CG55qE5YyX5p6B6ZmE6L+RPGJyPjwvcD4=
提示3:
PHA+5rKI5ous5Y+R546w5LqG56OB5YGP6KeSPC9wPg==
正确答案:QQ==
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