简述广告主题是如何确立的。

等差数列{a_n}中，若a₁，a₂₀₁₁为方程x²-10x+16=0的两根，则a₂+a₁₀₀₆+a₂₀₁₀=[ ]

A.15

B.10

C.20

D.40

For the purpose of expanding his business, Mr Zhang borrowed RMB 100,000 yuan from Mr Lee and would provide a mini-bus as the pledge to Mr Lee. However, Mr Lee returned the mini-bus to Mr Zhang because he did not hold a driver’s licence.Subsequently, Mr Zhang borrowed another RMB 100,000 yuan from Mr Wang and put the mini-bus as the pledge to Mr Wang. After the conclusion of the loan agreement and pledge agreement, Mr Zhang delivered the mini-bus to Mr Wang.During the period of his possession of the mini-bus, Mr Wang concluded a rental agreement with a transport company without the advance consent of Mr Zhang. The mini-bus was put into transportation service by the transport company but was totally destroyed in a traffic accident.Upon the expiration of the loan agreement, Mr Zhang came to repay the principal and interest. However Mr Wang could not return the pledged mini-bus to him.Required:Answer the following questions in accordance with the relevant provisions of the Property Law of China and give your reasons for your answer:

(d) explain against whom Mr Zhang should act in law for the recovery of the mini-bus. (3 marks)

 小梅同学学习了单质、氧化物、酸、碱、盐性质后，发现许多不同类别的物质反应时能生产盐，于是她构建了下图所示的知识网络图。铜及其化合物在工业上有重要的应用。借助网络图回答

(1)写出用酸和碱生产硫酸铜的化学方程式：______________________________。

(2)请你把图中①②处补充完整，要求不能与图中已有信息重复。

①___________，②___________

(3)根据网络图可制备物质。例如，某回收含铜电缆废料的工厂有下列制铜的方案

①写出下列步骤中的化学方程式：

步骤Ⅲ：__________________________。步骤V：___________________________。

②上述方案中可能造成空气污染的步骤是______________________ 。   

Of all the employed workers in the United States, 12.5 million are part of a temporary workforce. The United States Bureau of Labor Statistics counts 9.2 percent of workers as those who have______(1) they term "alternative employment arrangements." The government predicts that temporary staffing agencies______(2) experience growth of 49 percent by 2010. If numbers increase at the rate ______ (3), these companies will add 1.9 million new jobs by 2010. That’’s more than any______(4) industry.Temporary workers were the first ones to be affected by the recent economic recession, but they are______(5) to be the first to regain positions as the economy picks up and companies work to rebuild. Employers use temporary workers as a resource because_______(6) offer flexibility and come at a low cost. Many temporaries are categorized as "independent contractors" instead of employees,______(7) allows the employer to avoid______(8) certain taxes. Because they are not required to offer benefits to temporary workers, companies can save a great deal of money by hiring temps. Usually, temporary workers can qualify_______(9) benefits if they work for a staffing company for a certain length of time. Most temps, however, do not continue with one company long______(10) to qualify for them because they regard the position as a step on the ladder to a______(11) position later.According to Richard Wahlquist, president of the American Staffing Association, 75_______(12) of temporary workers hope for transition out of the temporary staffing category______(13) a period of time. Wahlquist finds that temporary workers spend about 11 weeks on various assignments before their______(14) out of the temporary workforce. Many use temporary positions to gain experience and skills______(15) they move on to better jobs. Wahlquist says that the temp workforce as a whole turns______(16) 400 percent each year.Tom Dilworth, research director at the Employment Policies Institute, explains______(17) some workers like having temporary jobs______(18) it affords them a great deal of elasticity with time and everything. Some temps only have a limited______(19) of time to work and temp agencies can help coordinate jobs to fit their schedules. Other sometimes-employees use temporary jobs to get an______(20) to a company from the inside, to get a foot in the door of a certain business or career._______(21) others take temporary positions in hopes their employers will change them over to permanent positions eventually.Nearly all the industries in the United States use temporary workers.______(22) to Tim Costello, coordinator of the North American Alliance for Fair Employment, the growth of temporary labor threatens______(23) job security of permanent workers who fear replacement, as well as the temps who are more accustomed to turnover. He predicts that there will continue to______(24) a gradual shift from permanent employees to contingent staffing, and that such a_____(25) in workplace demographics will "lead to lower wages, poorer working conditions, and more instability."

缺铁性贫血的实验室检查结果应是（）

A.血清铁降低、总铁结合力降低、转铁蛋白饱和度降低

B.血清铁降低、总铁结合力正常、转铁蛋白饱和度降低

C.血清铁降低、总铁结合力升高、转铁蛋白饱和度降低

D.血清铁降低、总铁结合力升高、转铁蛋白饱和度正常

E.血清铁正常、总铁结合力升高、转铁蛋白饱和度降低