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已知某厂商只有一种可变生产要素劳动L，产出为一种产品Q，且固定成本为既定，短期生产函数Q=-0.1L3+6L2+12L，求：

劳动的平均产量最大时雇佣的劳动人数。

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参考答案：30

单项选择题

Pharming is a scamming practice in which malicious code is installed on a personal computer or server, misdirecting users to （1） Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".

In phishing, the perpetrator sends out legitimate-（2） e-mails, appearing to come from some of the Web’s most popular sites, in an effort to obtain personal and financial information from individual recipients. But in pharming, larger numbers of computer users can be （3） because it is not necessary to target individuals one by one and no conscious action is required on the part of the victim.In one form of pharming attack, code sent in an e-mail modifies local host files on a personal computer. The host files convert URLs into the number strings that the computer uses to access Web sites. A computer with a compromised host file will go to the fake Web site even if a user types in the correct Internet address or clicks on an affected （4）entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing （5）

3（）

A.victimized 

B.personate 

C.identity 

D.latency
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单项选择题

编制设备巡视作业指导书是为了（）

A.保证设备安全运行

B.现代化安全管理的需要

C.指导值班员怎样巡视设备

D.保证值班员人身安全
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