19.在 IS–LM 模型中，若投資對利率反應極小(或幾乎沒有反應)，則貨幣政策對產出的效果將： (A)非常大 (B)非常小甚至無效 (C)與財政政策相同 (D)只影響物價

3. Which of the following is not determined by the principal quantum number, n, of the electronin a hydrogen atom?(A) the minimum wavelength of the light needed to remove the electron from the atom.(B) the energy of the electron(C) the shape of the corresponding atomic orbital(s)(D) the size of the corresponding atomic orbital(s)(E) All of the above are determined by n.