欧拉致德国公主的书信:关于自然哲学的不同学科(第II 卷)(英文版)    作 者:Leonhard Euler   ISBN:978-7-04-051070-6  出版时间:2019-01-08
LETTER LVIII. Why Does the Magnetic Needle Affect, in Every Place of the Earth, a Certain Direction, Differing in Different Places; and for What Reason Does It Change, with Time, at the Same Place?
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