【評論主題】12. 將下列運算結果，以適當的有效數字表示，何者正確？(A)1.2×4.55-3.45=2.01 (B)4.50÷1.50+3.40=6.40 (C)3.4×1.20-1.20×2.50=1.08

【評論內容】a 2 s.fb 3

【評論主題】79. Please choose the most stable cation? (A) I (B) II (C) III (D) IV (E) V

【評論內容】3>2>1…………………………………,.,.,.,.,.,.,.,,.,.,.,.,.,.,.,.,

【評論主題】75. What is the appropriate representation of the repeating unit of the following polymer? (A) I (B)

【評論內容】看一開始的結構 去後面斷一樣的結構出來