http://202.199.252.133/wanghongyu/pdf/lecture/EMField.pdf
Feynman
的话说,当有人问他电磁场的图像的时候,他第一反
应是去黑板上画出各种各样的小箭头
http://202.199.252.133/wanghongyu/pdf/lecture/EMField.pdf
Feynman
的话说,当有人问他电磁场的图像的时候,他第一反
应是去黑板上画出各种各样的小箭头
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