This is normal ...
The only thing that I am NOT certain is the magnetic poles of the earth - it c ...
not4weak 发表于 2012-12-11 00:51
From S to N ... and during the process, earth could have no magnetic field.
not4weak 发表于 2012-12-11 01:14
欢迎光临 华人论坛 (http://ftp.yayabay.com/forum/) | Powered by Discuz! 7.2 |