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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)

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中等教師資格檢定考

描述：申論題通殺法應用

完全獨占市場計算

描述：筆記完全獨占市場的計算題

風險

描述：風險

22. 下列離子半徑排列何者正確？ (A) Ga3+ > Ca2+ > K+ > Cl- > S2- (B) S2- > Cl- > K+ > Ca2+ > Ga3+ (C) Ga3+ > S2- > Ca2+ > Cl- > K+ (D) Ga3+ > Ca2+ > S2- > K+ > Cl-

30、 （ ） 小張預計12年後上大學，屆時需學費120萬元，若小張的父親每年投資8萬元於年投資報酬率3%的債券型基金，請問12年後是否足夠支付當時學費？差額多少？（取最接近值） (A) 不夠，還少約6.5萬元 (B) 夠，還多約6.5萬元 (C) 不夠，還少約5.8萬元 (D) 夠，還多約5.8萬元。

25.小張預計 12 年後上大學，屆時需學費 120 萬元，若小張的父親每年投資 8 萬元於年投資報酬率 3%的債券 型基金，請問 12 年後是否足夠支付當時學費？差額多少？（取最接近值） (A)不夠，還少約 6.5 萬元 (B)夠，還多約 6.5 萬元 (C)不夠，還少約 5.8 萬元 (D)夠，還多約 5.8 萬元

23.小張預計 12 年後上大學，屆時需學費 120 萬元，若小張的父親每年投資 8 萬元於年投資報酬率 3%的債券型基 金，請問 12 年後是否足夠支付當時學費？差額多少？（取最接近值） (A)不夠，還少約 6.5 萬元 (B)夠，還多約 6.5 萬元 (C)不夠，還少約 5.8 萬元 (D)夠，還多約 5.8 萬元

46. Which one of the descriptions below about RNA polymerase III is correct? (A) is located in the nucleolus and transcribes the RNA genes of large and small ribosome subunits. (B) is located in the nucleoplasm and transcribes the protein-encoding genes through mRNAs. (C) transcribes the 5S RNA genes. (D) transcribes genes associated with tRNA processing. (E) transcribes tRNA genes and protein transport genes.

7 Rags-to-riches stories read like scripts for movies, but they're the true-life dramas of ______born into deep poverty but becoming superstars. (A) celebrities (B) criminals (C) villains (D) swindlers