内伤头痛常用治法有（） A.滋阴补肾 B.补益气血 C.平肝熄风 D.化痰降逆 E.

指令中有哪两种表示操作数类型的方法？

设置农业技术经济效果评价体系有哪些作用？

某公司以工程紧急为由，在未取得施工许可证的情况下擅自开工，施工中，把未经处理的污水经城市污水管网排入附近小河，趁夜间将建筑垃圾混入生活垃圾随地倒弃。夜间通宵施工。被噪声影响的居民投诉后，经地方人民政府城市市容环境卫生主管部门到施工现场检查，还发现施工现场的生活设施不合卫生标准，标牌设置不符合标准等，主管部门根据对该工程项目的检查事项作出了罚款的处罚。

市容环境卫生主管部门对该工程实施处罚的根据应包括的事项是( )。

A．施工现场的标牌不符合相关规定

B．建筑垃圾分散混入生活垃圾

C．夜间施工噪声扰民

D．将污水处理后排入附近城市河流

推力油槽渗漏试验检查哪些部位及检查方法？

Internet advertising is booming. The industry has gone from $ 9.6 billion in revenue in 2001 to $ 27 billion this year, according to Piper Jaffray, an investment bank. And it is still early days. The internet accounts for only 5% of total spending on advertising, but that figure is expected to reach at least 20% in the next few years. The single largest category within this flourishing industry, accounting for nearly half of all spending, is "pay-per-click" advertising, which is used by firms both large and small to promote their wares.

The benefits of the pay-per-click approach over traditional advertising (television, radio, print and billboards are obvious. Since advertisers pay only to reach the small subset who actually respond to an advertisement, the quality of the leads generated is very high, and advertisers are prepared to pay accordingly. The price: per click varies from $ 0.10 to as much as $ 30, depending on the keyword, though the average is around $ 0.50. Google made most of its $ 6.1 billion in revenue last year from pay-per-click advertising.

But as pay-per-click advertising has grown into a huge industry, concern has mounted over so-called "click fraud"--bogus clicks that do not come from genuinely interested customers. It takes two main forms. If you click repeatedly on the advertisements on your own website, or get other people or machines to do so on your behalf, you can generate a stream of bogus commissions. Click fraud can also be used by one company against another: clicking on a rival firm’s advertisements can saddle it with a huge bill. Bogus clicks are thought to account for around 10% of all click traffic, though nobody knows for sure.

A few months ago Mr. Gross pioneered an alternative to the pay-per-click model. In February, Snap, a search engine backed by Mr. Gross, launched "pay-per-action" (PPA), a new model in which advertisers pay only if a click on an ad is followed by an action such as a purchase or a download.

Might this put an end to click fraud Don’t bet on it, says Mike Zeman at Starcom, an advertising agency. Payper-action will be a niche, he predicts, since converting a click into an action depends on a variety of factors such as the ease of use of the advertiser’s website. Google and its peers will be reluctant to be so dependent on factors outside their control. But Mr. Tobaccowala thinks pay-per-action could become a real alternative to pay-per-click. As bigger companies spend more on internet advertising; they will demand more accountability and a wider range of options, he says. At the very least, that means clamping down on click fraud; but it also presents an opportunity for entrepreneurs to invent new models that are less vulnerable to abuse.

The PPA will become more popular due to （）

A. the shortcoming of pay-per-click

B. the fraud click

C. the punishment for click fraud

D. the adoption of leading operators