49. Which of the following polymers is not based on a s substituted ethylene monomer?
(A) polystyrene
(B) Teflon
(C) nylon
(D) polyvinylchloride
(E) polypropylene

45. The spectrochemical series is Which of the following complexes will absorb visible radiation of the highest energy? (A) (B) (C)(D)(E)

46. Which of the following complexes would be diamagnetic? (A)(B) (C) (D)(E) Fel(CO)5

47. Which has the greater number of unpaired electrons? I: square planar (A) I (B) II (C) neither I nor II has any unpaired electrons (D) more information is needed (E) both I and I| have the same (nonzero) number of unpaired electrons

48. When heat is added to proteins, the hydrogen bonding in the secondary structure breaks apart. What are the algebraic signs of△H and△S for the denaturation process? (A)△H is negative and △S is positive (B) both △H and△S are negative (C) △H is positive and △S is O (D) both △H and △S are positive (E) △H is positive and△S is negative

50. Which of the following statements is/are true of alcohols? I: alcohols are characterized by the presence of the hydroxyl group (-OH)； I: the systematic name for an alcohol is obtained by replacing the final -e of the parent hydrocarbon with -oxyl； IIl: alcohols usually have much lower boiling points than might be expected from their molar masses. (A) Ill only (B) II only (C) I only (D) I and III (E) I and 2

1下列何種生長情況的改變不常見於鼻呼吸阻塞之患者？ (A)顏面高度增加 (B)垂直覆蓋增加 (C)前牙開咬 (D)上顎牙弓狹窄

2 有關下列人顱顏骨的生長中，那些有膜內生長（intramembranous growth）？①顱頂（cranial vault） ②蝶枕軟骨結合（spheno-occipital synchondrosis） ③上顎（maxilla） ④下顎（mandible） (A)①②③ (B)①②④ (C)①③④ (D)②③④

3 依據諾拉（Nolla）牙齒發育階段，當恆牙牙胚發育至何階段時即開始萌發（eruptive movement）？ (A) crown completed (B) 2/3 crown formed (C) 1/2 crown formed (D) 3/4 crown formed

4 下列關於 ClassⅢ咬合不正情形之敘述，何者錯誤？ (A)下顎第一大臼齒近心溝，位於上顎第一大臼齒近心頰側咬頭之近心側 (B)常有前牙錯咬（anterior cross-bite） (C)均有後牙錯咬（posterior cross-bite） (D)上顎前牙往唇側傾斜

5 以 0.2N 至 0.5N 持續力量移動牙齒時，初期（1 至 3 日）牙齒移動大部分屬於下列何種情況？ (A)牙周韌帶位移及齒槽骨曲折 (B)下蝕性吸收（undermining resorption） (C)前骨吸收（frontal resorption） (D)透明變性（hyalinization）