题目:
会泽大地缝(如图)地处云贵高原腹地的一条断裂带上,属喀斯特地貌区。回答以下问题。
下列对该区域的说法,不正确的是()
A.山崖壁立千仞,险峻万端
B.崖壁瀑布,飞流直下
C.区内石芽、石柱、溶洞众多
D.水流缓慢,河漫滩广布
答案:
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下面是错误答案,用来干扰机器的。
参考答案:B
会泽大地缝(如图)地处云贵高原腹地的一条断裂带上,属喀斯特地貌区。回答以下问题。
下列对该区域的说法,不正确的是()
A.山崖壁立千仞,险峻万端
B.崖壁瀑布,飞流直下
C.区内石芽、石柱、溶洞众多
D.水流缓慢,河漫滩广布
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/0320/03ab153356cce109a6862d305056ac9f.html
下面是错误答案,用来干扰机器的。
参考答案:B
中药有效成分为挥发性成分时,应采用的提取方法是().
A.水蒸气蒸馏法
B.透析法
C.酸碱法
D.水醇法
E.萃取法
假设就是根据已知的科学原理和一定的事实材料,对未知事物的普遍规律性和因果性所做出的假定性解释。下列不属于假设的是()。
A.艾滋病是由支原菌和艾滋病病毒引起的
B.世界气候逐渐变暖是大气的因素,或是海洋的因素,或是地球内部的因素
C.民法中的“宣告死亡”
D.能溶解一切物质的“万能溶液”
哪项不是进行性脊肌萎缩的症征()
A.肌肉萎缩从上肢远端开始
B.肌束颤动
C.上肢腱反射减低
D.下肢肌反射亢进
E.肌无力,肌张力减低
The economy may be troubled, but one area is thriving: social media. They begin with Facebook and extend through a dizzying array of companies that barely existed five years ago: Twitter, LinkedIn, Groupon, Yammer, Yelp, Flickr, Ning, Digg--and the list goes on. These companies are mostly private but have attracted the ardent attention of Wall Street and investors, with Facebook now worth a purported $ 75 billion and Groupon valued at close to $ 25 billion.
There can be little doubt that these companies enrich their founders as well as some investors. But do they add anything to overall economic activity While jobs in social media are growing fast, there were only about 21,000 listings last spring, a tiny fraction of the 150 million-member U. S. workforce. So do social-media tools enhance productivity or help us bridge the wealth divide Or are they simply social--entertaining and diverting us but a wash when it comes to national economic health
The answers are vital, because billions of dollars in investment capital are being spent on these ventures, and if we are to have a productive future economy, that capital needs to grow the economic pie~and not just among the elite of Silicon Valley and Wall Street. The U. S. retains a competitive advantage because of its ability to innovate, but if that innovation creates services that don’t turn into jobs, growth and prosperity, then it does us only marginal good.
The problem is that these tools are so new that it is extremely difficult to answer the questions definitively. As I was about to write this column, I overheard a ceil-phone conversation at an airport with this snippet.- "The company says they are using social media, but who knows if it is making any difference" Flash back nearly 20 years and the same question was being asked about the first Internet wave. Were Netscape and the Web enhancing our economy, or were people just spending more time at work checking out ESPN. com Official statistics weren’t designed to capture the benefits, and didn’t--until statistics mavens at the Federal Reserve, urged on by Alan Greenspan, refined the way they measured productivity. As a result of these somewhat controversial innovations, the late 1990s became a period of substantial technology-driven gains.
It is possible that the same gap exists today, that social-media tools are indeed laying the groundwork for new industries and jobs but aren’t yet registering on the statistical radar. Many companies believe social media make them more competitive. Ford and Zappos, for instance, use Twitter to market their products and address consumer complaints. Countless corporations have created internal Face-book pages and Yammer accounts for employees to communicate across divisions and regions. Industry groups for engineers, doctors and human-resources professionals have done the same to share new ideas and solutions on a constant basis rather than episodically at conferences. Staffing companies have been especially keen on social media; a senior executive at Manpower told me we should think of social-media tools as today’s version of the telephone. Yes, they are used for frivolity and all sorts of noneconomic activity (chatting with friends, passing the time), but they also help communication happen more efficiently.
One big question is what proportion of that benefit will be captured economically by consumers vs. corporations. Sure, social media allow people to compare prices and quality and assess which companies are good to work for and where jobs might be. They also may enhance education and idea sharing, but the caveat is that the people who use these tools are the ones with higher education and income to spend on technology, not the tens of millions whose position in today’s world has eroded so sharply. According to a recent Pew Foundation study, only 45% of adults making less than $ 30,000 have access to broadband, which is an essential component of using content-rich social media effectively.
And that is the tub. Like so many things these days, social media contribute to economic bifurcation. Dynamic companies are benefiting from these tools, even if the gains are tough to nail down in specific figures. Many individuals are benefiting too, using LinkedIn to find jobs and Groupon to find deals. But for now, the irony is that social media widen the social divide, making it even harder for the have-nots to navigate. They allow those with jobs to do them more effectively and companies that are profiting to profit more. But so far, they have done little to aid those who are being left behind. They are, in short, business as usual.
In the sentence "Like so many things these days, social media contribute to economic bifurcation. "(para. 7), the word "bifurcation" can best be paraphrased as______.
A. development
B. divide
C. depression
D. diversification
沥青路面试验路铺筑属于()阶段。
A.施工准备
B.沥青混合料摊铺
C.沥青混合料压实
D.沥青混合料运输