对于股份制和股票的有关知识，正确的有 ( ) ①股份制企业的国有、集体股份是公有

Over_____ past thirty years, the old man has led _____ comfortable life.

A．the; the

B．a; the

C．the; a

D．a; a

标准状况下1.68 L气态烃在足量氧气中完全燃烧。若将产物通入足量澄清石灰水，得到的白色沉淀质量为15.0 g；若用足量碱石灰吸收燃烧产物，增重9.3 g。

（1）计算燃烧产物中水的质量。   

（2）通过计算推断气态烃的分子式。

以下提供若干个案例每个案例下设若干道考题。请根据答案所提供的信息，在每一道考题下面的A、B、C、D、E五个备选答案中选择一个最佳答案。

05，应与求得的统计量F值做比较的临界值是

A．F_(2,30)0.05

B．F_(2,28)0.05

C．F_(2,31)0.05

D．F_(2,28)0.025

E．F_(2,28)0.10

LC振荡电路的电容为C，电感为L，则电容器两板间电势差从正向最大值到反向最大值所需的最短时间为t=______，若电磁波在真空中的传播速度为c_真，则此电路发射的电磁波在真空中传播时波长为λ=______．

People don’t want to buy information online. Why Because they don’t have to. No more than that because they’re used to not paying for it. That’s the conventional wisdom. Slate, Microsoft’s online politics-and-culture magazine, is an oft-cited example of the failed attempts to charge a fee for access to content. So far, for most publishers, it hasn’t worked.

But nothing on the Web is a done deal. In September graphics-soft-ware powerhouse Adobe announced new applications that integrate commerce into downloading books and articles online, with Simon & Schuster, Barnes and Noble, and Salon. corn among its high-profile partners. Some analysts put the market for digitized publishing at more than $100 billion. Of course, if the Internet can generate that kind of money—some might say almost any kind of money—people want in. And this couldn’t come at a better time. Newspaper and magazine writers in particular are increasingly frustrated by their publishers, which post their writings online but frequently don’t pay them extra.

So here’s the good news: Fathrain. com, the third biggest book-seller on the Net—after Amazon. com and Barnesandnoble. corn—is now doing just what the publishing industry that made it a success fears., it’s offering a secure way to pay for downloadable manuscripts online. Fatbrain calls it offshoot eMatter. With it, the company’s executives have the radical notion of ousting publishers from the book-selling business altogether by giving writers 50% of each and every sale (To reel in authors, eMatter is running a 100% royalty promotion until the end of the year. ) Suggested prices to consumers range from a minimum $ 2 to $ 20, depending on the size of the book to download.

"This will change publishing forever!" Chris MaeAskill, co-founder and chief executive of Fatbrain, declares with the bravado of an interior decorator. "With eBay, anybody could sell antiques. Now anybody can be published. "

There’s been no shortage of authors wanting in. Within a few weeks, according to the company, some 2,000 writers signed on to publish their works. Some of this is technical stuff—Fatbrain got where it is by specializing in technical books—but there are some well-known writers like Catherine Lanigan, author of Romancing the Stone, who has put her out-of-print books and a new novella on the site. Another popular draw is Richard Bach, who agreed to post a 23-page short story to the site.

Not everyone thinks downloadable documents are the biggest thing in publishing since Oprah’s Book Club. "I think it will appeal to sellers more than buyers," says Michael May, a digitalcommerce analyst at Jupiter Communications, which released a report that cast doubt on the market’s potential. "A lot of people are going to publish gibberish. The challenge is to ensure the quality of the work. "

Blaine Mathieu, an analyst at Gartner Group’s Dataquest, says, "Most people who want digital content want it immediately, I don’t know if this model would satisfy their immediate need. Even authors may not find that Web distribution of their works is going to bring them a pot of gold. For one thing, it could undermine sales rather than enhance them. For another, anybody could e-mail downloaded copies of manuscripts around town or around the world over the Net without the writer’s ever seeing a proverbial dime. " Softlock. com, Authentica and Fatbrain are trying to head this problem off by developing encryption padlocks that would allow only one hard drive to receive and print the manuscripts. For now, the problem persists.

What is implied in the passage about the publishers’ practice now ？（）

A.They are willingly engaged in the e-publishing business.

B.They usually do not pay extra royalty for their e-versions.

C.They can publish anyone’s works on Net.

D.They lack the sense of responsibility for their authors.