18.將 A and B or C or~(E＞F)轉換成後序表示法(post-order)表示應為? (A) A B and C or E F＞ ~ or (B) A B C E F and or ＞~ or (C) and or ＞~or A B C E F (D)A B C E F or ~＞ or and