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20. A uniform plate of mass M is placed on two fast-rotating identical wheels of radius r. The coefficients of kinetic friction between the plate and both wheels are μ, the distance between the centers of the two wheels is , the wheel on the right (left) rotates counterclockwise (clockwise) with angular speed ω (see Fig. 5), and the gravitational acceleration is denoted g. If the mass center of the plate is displaced by d from the center of the two wheels, what is the frequency the plate oscillates with? (Assuming the plate is so heavy that it always stays on the wheels.)(A) ω (B) (C) (D)

19. As shown in Fig. 4, an m1 = 1.0 kg block is placed on top of an m2 = 8.0 kg block, which lies on a frictionless surface. The coefficient of kinetic friction between the two blocks is 0.20; they are connected via a pulley and a string. A hanging block of mass m3 = 6.0 kg is connected to the mass m2 block via another pulley and string. Both strings are massless and the pulleys are frictionless. What is the acceleration magnitude of the blocks? (Gravitational acceleration g =9.8 m/s²) m1 m2 M3 Figure 4. A system composed of three blocks, strings, and pulleys. (A) 3.7 m/s² (B) 2.7 m/s² (C) 9.7 m/s2 (D) 8.0 m/s²

18. The effective resistance from a to b in Fig.3 is 4.0 2.What is the resistance of individual resistors in the circuit? (The resistances of all the individual resistors are the same.) (A) 4.02(B)2.0 Ω (C) 8.0 Ω (D) 0.8 2

(b) Use curved arrows to describe the detailed mechanism of these two steps. (8 points)

(a) Please draw two key resonance structures of diazomethane. (8 points)

2.Electrophilic aromatic substitution reactions of pyridine normally occur at C3. Draw the carbocation intermediates resulting from reaction of an electrophile at C2, C3, and C4, and explain the observed result. (14 points)

藥理學與藥物化學分章節題庫(108-1～115-1)

講師：Pharm_MADAO

簡介：● 收錄108-1～115-1之藥理學與藥物化學國考題 ● 分章節整理試題，幫助考生複習各章節之內容 祝考試順利

郵局英文

講師：Terry Tung

簡介：整理歷屆郵局英文考題分類

國中會考英文總複習

講師：Terry Tung

簡介：本課程依據最新國中會考英文題型與命題趨勢，精心設計全面的學習內容，涵蓋字彙、片語、文法、克漏字、連續...

警察特考犯罪學-實證學派的代表學者（犯罪學三聖）

描述：此檔案提供給四等行政警察考生於考前快速複習用!!!(*提醒：完美主義者慎入)

警察特考犯罪學-潛伏特質理論

描述：此檔案提供給四等行政警察考生於考前快速複習用!!!(*提醒：完美主義者慎入)

警察特考犯罪學-整合犯罪學

描述：此檔案提供給四等行政警察考生於考前快速複習用!!!(*提醒：完美主義者慎入)

5. 下列有關無編碼 RNA (non-coding RNA, ncRNA)功能的敘述，何者最不恰當？ (A) microRNA (miRNA)藉著配對互補的模板 mRNA 調節轉譯 (B) microRNA 與 small interfering RNA (siRNA)的前驅分子(precursor)皆為單股 (C) piwi-interacting RNA (piRNA)可誘導異染色質(heterochromatin)的產生 (D) 有些 ncRNA 會促成 X 染色體基因的去活化

47. 下列關於 small interfering RNA (siRNA)的敘述何者正確？ (A) 可以折疊成 tRNA 結構 (B) 核糖體中的小 RNA 組成之一 (C) 長度約為 20 到 25 個核苷酸，可和 mRNA 互補配對抑制基因表達 (D) 又稱 Dicer，可分解 mRNA

60. The RNA-guided Cas9 nuclease and clustered regularly interspaced short palindromic repeats (CRISPR) enable efficient genome engineering in eukaryotic cells. Which of the following statements about this system is correct? a) originally belong to the microbial adaptive immune system, b) RNA- guided Cas9 nuclease cleaves genetic elements, c) engages DNA repair system, d) a useful tool for specific gene knockdown, e) insertion or deletion usually leads to frameshift mutations. (A) abd (B) abcd (C) bde (D) abce (E) all

62. Which of the following mechanism is NOT how bacteria defend against phage infection? (A) bacteria with mutant receptors unrecognizable to phages (B) restriction enzymes degrade exogenous genetic elements (C) type II topoisomerases facilitate conformational changes of DNA during replication and transcription (D) CRISPR-Cas system (E) none

22 依實務見解，關於教師與學校關係，下列敘述何者錯誤？(A)公立各級學校教師與學校間之基礎關係，為行政契約關係 (B)公私立大學教師資格審定與升等之決定，均為行政處分 (C)公立學校教師之解聘，其法律性質屬不利益行政處分 (D)私立大學教師對於解聘，得以教育部之核准為程序標的，提起撤銷訴訟

23. 二行程主機典型的滑油系統，經外部管路及內部通道將滑油送入機器各部件潤滑，下列何者為錯誤？ (A) 主軸承、曲柄栓軸承 (B) 導靴、導板 (C) 凸輪軸軸承、傳動齒輪 (D) 推力軸承、轉車機