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Imagine an antenna that radiates energy equally in all directions, much ...
Radar cross-section (RCS) is a measure of how detectable an object is by...
进去之后把页面拉到最下方
https://math.stackexchange.com/questions/2402504/orthogonal-projection-o...
不管 +'0' -'0'，实际上都是对ASCII码的计算，最终返回一个double类型的结果'9' - '0'，'9'的ASCII码是57， ...