資訊推薦

• 4 何種定律可證明一個自由電子無法產生光電效應？(A) 能量守恆定律(B) 動量守恆定律(C) 能量和動量守恆定律(D) 角動量守恆定律
• 5 質量衰減係數的單位為何？(A) kg/m2(B) kg/m(C) m2/kg(D) m/kg
• 6 相同物質產生光電作用時，如果作用機會愈大，則電子束縛能？(A) 愈小(B) 愈大(C) 不一定(D) 為零
• 7 三項發生（triplet production）和成對發生（pair production）最大的不同點是什麼？(A)兩者產生的電子能量不同(B) 兩者產生的正電子能量不同(C)兩者發生的場域（f
• 8 操作尖峰電壓為 E 的 X 光機，其所發出之能量約相當於多少 E 的單能 X 光射束？(A) 1.65(B) 1.00(C) 0.87(D) 0.33
• 9 直線加速器在電子束打到靶之前，大多會讓電子做彎曲角度的前進，最主要功用是？(A) 選擇單能電子的射束(B) 提高劑量率(C) 減少中子污染(D) 降低洩漏輻射
• 10 25 MeV 的光子射束打到病人後，會和體內的氧起作用，產生放射性核種，此核種又會變成穩定的那個元素？(A)氧─15(B) 氮─15(C) 碳─15(D) 硼─13
• 11 平均壽命和以下那一項最有關聯？(A) 穿透率(B) α衰變(C) β衰變(D) 半衰期
• 12 有關醫用診斷 X 光有用射束裏，腳跟效應（heel effect）發生在靠 X 光管內那裡的 X 光強度會較低？(A) 上方(B) 中間(C) 陰極側(D) 陽極側
• 13 原子能階主要是在描述什麼？(A) 質子能量(B) 原子核能量(C) 電子軌道能量(D) 中子能量
• 5. ＝a＋b，若 a 為正整數且 0＜b＜1，則 a＝？(A)2499 (B)2500 (C)2450 (D)2449
• 6.下列哪一個數不是不等式－3x－7≦3－x 的解？(A)－6 (B)1.7 (C)－3.14 (D)0
• 三、閱讀測驗      Last year, people are crazy about coloring books. Now, it has become less active and bee
• 【題組】29. Why are more and more people interested in writing?(A) Because people will forget how to wri
• 【題組】30. What kind of industry isn’t influenced by the penmanship?(A) fountain-pen industry(B) publis
• 2. The government has sent delegates to ______ with Japan for a free-trade agreement.(A) foster (B)
• 3. The party leader tends to make ______ decisions without reasoning and without thinking aboutthe c
• 4. An unmade but ______source told BBC News that several high-ranking officers were involvedin the s
• 5. As the pilot of the aircraft, you have the responsibility to use everythig ______to ensure safefl
• 6. I am Dr. Lee's lawyer. I am calling ______ him, who wishes to complain about the car he boug
• 7. We'd love to have you ______since you just moved to the neighborhood and don't have man
• 8. At first, Mr. and Mrs. Wang thought the man hit their car by accident； but then they realized hed
• 9.You cannot use common ______expressions in formal writing.(A) constitutional (B) congressional (C)
• 10. The Minister of Economy is meeting his Japanese ______ in Tokyo today.(A) correspondent (B) coun
• 11. One could face the death penalty for attempting to ______drugs into our country.(A) slaughter (B