关于行政许可的撤销，下列哪些说法是正确的？（）A、被许可人以欺骗、贿赂等不正当手段取

Which of the following statements does NOT describe the role of a portfolio manager in perfectly efficient markets Portfolio managers should:（）

A. construct diversified portfolios that include international securities to eliminate unsystematic risk.

B. quantify client’s risk tolerance, communicate portfolio policies and strategies, and maintain a strict buy and hold policy avoiding any changes in the portfolio to minimize transaction costs.

C. help clients minimize taxes and reduce trading turnover.

食管癌好发部位是（）

A.颈部食管

B.胸部食管上段

C.胸部食管中段

D.胸部食管下段

E.腹部食管

网桥是一种常用的网络互联设备，它工作在OSI的数据链路层上。在LAN中用于桥接少量以太网网段时，常用的网桥是______。

A．封装网桥

B．源选径桥

C．转换网桥

D．透明网桥

One method of reducing the length of radio transmissions without distorting the meaning of your words is by using（）.

A.slang

B.secret codes

C.procedure words

D.analogies

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