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  1. 1. They are chemistrical proper noun. n is on behalf of Principal quantum number. It decides the orbital's size and the energy increases by the distance from the nucleus increases. And the value of n is a positive integer(it doesn...

    分類:社會與文化 > 語言 2007年10月10日

  2. The tangent function is one of trigonometric functions. The graph of tangent function is symmetrical at the orgin i.e. at the (0, 0) f(x)=tanx, x isn't equal to π/2+kπ let y is belong to real number. it's graph is as follows. http://teacher...

    分類:社會與文化 > 語言 2007年10月07日