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问题 选择题

下列除去杂质的方法正确的是（　　）

A．除去溴苯中的少量溴：加入KI溶液，充分反应后，弃去水溶液

B．除去FeCl2溶液中的少量FeCl3：加入足量的铁屑，充分反应后，过滤

C．除去苯酚溶液中的少量甲苯：加入酸性高锰酸钾溶液，充分反应后，弃去水溶液

D．除去N2中的少量O2：将气体通过灼热的氧化铜粉末，再收集气体

答案

答案：B

填空题

启用AMR功能必须在MSC配置支持语音编解码算法（），另外还必须把A接口协议阶段标志配置为PhaseII+。
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问答题

There is a growing number of economists who believe today’s brutally tough labor market is not a temporary American oddity. Falling wages, reduced benefits and rising job insecurity seem to be increasingly entrenched features of the job scene across most of Western Europe, the United States and other parts of the developed world. The number of insecure freelance positions is rising (as are working hours) while stable jobs with good benefits are being cut. Laid-off workers are much less likely to be rehired by their old companies and have to find new jobs or turn to self-employment. Those who still have jobs are working longer hours with little prospect of meaningful raises. The new labor market is shaped by growing global competition, spurred by the rise of cheap manufacturers in China, India and Eastern Europe, and the price-chopping effect of both the Internet and giant retailers led by Wal-Mart. These forces compel Western companies to exercise a growing restraint on prices and labor cost. One thing globalization clearly does is to exert a leveling effect on wages.
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