电缆终端、中间接头的外壳与电缆金属护套及铠装层均应良好接地。接地线应采用铜绞线,其截

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问题:

电缆终端、中间接头的外壳与电缆金属护套及铠装层均应良好接地。接地线应采用铜绞线,其截面不宜小于()

A、4mm2

B、5mm2

C、10mm2

D、16mm2

考点:低压电工考试低压电工考试题库
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王安石于公元1042年中进士,先后做过苏州通判,常州知州等地方官,公元1069年被提拔为参知政事。以下对王安石仕途中职位的描述,错误的是[     ]

A.通判负责监督知州                 

B.知州管理地方行政  

C.通判的设置有利于加强中央对地方的控制     

D.参知政事行使地方监察权

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患者男性,40岁,多次发作心悸,心电图一-见下图,显示为预激图形。

食管电生理检查测得旁路前传有效不应期为240ms,提示()。

A.低危旁路

B.高危旁路

C.非危险旁路

D.可能危险

E.以上都不是

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用于肝癌诊断的指标有()

A.ALT

B.AFP

C.ALP

D.PⅢP

E.GGT

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商品储存立体化是指用高层货架储存商品,以巷道堆垛起重机(简称巷道机)存取商品,并通过周围的装卸运输设备,自动进行出入库作业。这类仓库称为“高层货架仓库”。()

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The sudden, dramatic explosion in value of online social media sites like Facebook and Twitter is reminiscent of the rise, about 15 years ago, of the online businesses that created the "dotcom bubble. " The Internet was far less widely used than it is today. Still, visionaries saw the potential for the Internet we have today, so virtual companies sprung up and grew like weeds as investors threw money their way. Some, like Google and Amazon, developed an enduring online presence and lasting financial value. But far too many quickly lost value when it became apparent that their rapid growth wasn’t yielding revenue.

So, how much is Facebook’s network of users really worth The potential is clear—when so many people are gathered in one virtual place, offering so much personal information about themselves, they create an unprecedented platform for targeted advertising. Or they would, if they were on the network to shop. When eBay and Amazon suggest products to their customers, they’re talking to people who’ve already proven that they’re interested in buying similar products. People go on Facebook for a variety of reasons-to catch up with old friends, share pictures, make new acquaintances, and talk, sometimes endlessly, about themselves. Whether they’ll appreciate having their virtual conversations interrupted by advertising, targeted or not, remains unclear.

It’s also unclear whether Facebook will actually be able to share information about its users’ browsing habits with advertisers. Complaints about the ineffectiveness of Facebook’s privacy policies have arisen in multiple countries, part of a larger social concern about how private information gets used on line. In December, the Federal Trade Commission issued a proposed framework that, among other things, would permit Facebook users to block advertisers from accessing information about their online interests. If that framework is implemented and widely used by Facebook subscribers, it could seriously impair the site’s value as a potential platform for targeted marketing.

What is clear is that Goldman Sachs has a significant interest in Facebook’s financial value, at least for the short term. Goldman Sachs’ decision to invest heavily in Facebook has had some interesting impacts. For one thing, the investment has allowed Facebook an opportunity to postpone issuing an IPO. That means that, at least for the moment, Facebook doesn’t yet have to disclose its finances or publicly address investor complaints.

Goldman Sachs’ investment also puts the firm in an ideal position to handle Facebook’s IPO when it eventually is issued, perhaps sometime next year. That, of course, has the potential to generate substantial revenues for Goldman Sachs’ clients. Google’s 2004 IPO raised an initial $1.2 billion for the company. After all the propaganda, Facebook’s IPO can hardly be expected to raise less. However, there remains a significant question as to whether Facebook’s potential for generating income is more virtual than real. If it turns out that Facebook can’t live up to its potential for generating advertising revenue, venture capitalists who invest for the long term may get burned.

Goldman Sachs’ investment is a good thing to Facebook because()

A. Facebook is now finding itself short of money

B. venture investment is safer than issuing an IPO

C. it gives Facebook more time for propaganda

D. Facebook does not have to make its finances public yet

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