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問題的種類

英文 高中

請問這題的B.和C.要怎麼判斷 謝謝

第43. 至46. 題為題組 It might be hard for us to imagine having Coca-Cola as the only drink instead of fresh water. Yet, it has been the case in San Cristóbal for the past few decades. Located in southeastern Mexico, San Cristóbal, once a rainy place, can only enjoy potable water every other day. Water does trickle down from public pipes, but it's all but undrinkable, with too much chlorine. The locals find water purifiers unaffordable or even unimaginable. Hence, they end up drinking Coca-Cola, which is produced locally and far more readily available than tap water. With residents there drinking on average more than two liters of Coca-Cola on a daily basis, the real price to pay for such an alternative to plain water, however, is the sacrifice of people's physical health. Diabetes has been one of the leading causes of death, second only to heart disease, though the latter also has a lot to do with one's sugar consumption. Struggling with obesity and the many chronic diseases is now defining many local people's adolescence and adulthood. Annually, more than 3,000 lives of San Cristóbal are claimed due to their unhealthy drinking habit. The culprit, as most locals believe, is the bottling plant for Coke, a Mexico-based multinational food company owned by Femsa. The plant, with its contribution to the government's tax revenue, has long been granted daily access to more than 300,000 gallons of water in San Cristóbal to churn out the a

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英文 國中

我不會啊~

ng Thanks to weekend? bl. ep drinking bid drinking rked nths ago Bas 看圖詳答問題:每題2分,共10 分 八、閱讀測驗:每題2分,共4 五 a chef in a local restaurant a 19 Australia is famous for wheat, wool, gold, and coal. They grow food plants and raise animals, Their service industry is also very famous. These years, Australia is working hard on tourism. Its wonderful sights and animals get a large number of people to visit there every year. Because Australia is not far away from Asia, it becomes a new favorite for Asian students. If you under the age of 31, you can get a working holiday visa. With the visa, you can enjoy the life outside Asia, get different job choices, make money, and le English at the same time. U wheat 小麥 養育 service industry sights if wool coal Prow 1. What does Mark enjoy doing? America, He dog ene planting me 2. Did Eudora spend three hours studying yesterday? No, she hadet spend three how studying weiterelay - z 3. What are the Chen family planning to do? They Aplanning -2 4. Does Connie enjoy going to a concert (9) in Korea? Yes, she en concert en going in Korea 5. What did Josh begin to work as last month? waiter last month. raise tourism Also to USA D) 1. Why does Australia draw many As to a these years? (A) Because of its beautiful sight B) Because of its animals. (C) Because it has wheat, woc D) Because they don't have as a 六、依提示作答:每題3分,共 15 分

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自然科學 大學

求解答案是否正確

Multiple-choice questions: (70 points) write the letter of statement that is not true: 1. A.B.U The Drude Model: (a) It is a classical approach using concepts from the kinetic theory of gases. (b) A relaxation-time approximation is used where the probability of collision is l/t. (c) No forces act on the electrons in between collisions. (d) It predicts accurately the electronic heat capacity of metals. 2. The Sommerfeld Model: (a) The crystal potential is replaced by an average Coulomb potential. (b) The separation of states is so close that a continuum model can be applied. (c) The electrons are highly localized due to a strong crystal potential. (Q) The energy of the highest occupied state at 0 K is the Fermi energy. 3. Density of states in k-space, N(k): (a) N(k) is determined by the boundary value conditions. (b) For lattices in any dimensions, N(k) is constant in k-space. (C) N(k) depends on the direction and magnitude of k. (d) It is directly proportional to the volume of the crystal. E影響, c 4. The Fermi surface of a metal: (a) is responsible for many of the transport properties of the metal, (b) depends on the nature of the chemical bonds, (c) is always a sphere, (d) can involve mixing of electron orbitals. ✓ 5. The conductivity of a material () increases with the mobility of its carriers, (b) increases with the density of carriers, (C) it is inversely proportional to the energy gap. cogu changes with temperature. 6. BID Plasmons: (a) They are an important characteristic of the Sommerfeld electron gas model. (b) Plasmons occur spontaneously in metals. (c) They are related to charge density oscillations. (d) The Plasmon energy is typically of the order of 10 eV. The Fermi energy Ef in intrinsic semiconductors 8) is usually close to y E, at OK (b) it ACiD. can increase or decrease with temperature depending on the ratio of hole and electron effective masses, (c) it represents the point at which the probability of occupation is 12, even though there may not been any states with that energy, (d) its value relative to the electronic bands must remain unaffected in the presence of defects or interfaces.

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