某溶液中加入金属铝有氢气放出，则在此溶液中可能大量共存的离子是（） A．K+、F

发布时间：2017-05-03 02:45 │ 来源：www.tikuol.com

题型：选择题

问题：

某溶液中加入金属铝有氢气放出，则在此溶液中可能大量共存的离子是（）

A．K⁺、Fe²⁺、NO₃^-、SO₄^2-

B．K⁺、Na⁺、Cl^-、HCO₃^-

C．K⁺、Na⁺、AlO₂^-、SO₄^2-

D．K⁺、NH₄⁺、Cl^-、CO₃^2-

考点：离子共存

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在保险承保中，对于属于优质风险类别的保险标的，保险公司按低于标准费率的费率予以承保。这一承保决策属于（）。

A.正常承保

B.优惠承保

C.有条件地承保

D.拒保

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下面是一则消息，其中画线处都有语病，请加以改正。

　　近日，①麦坪遗址抢救性发掘获重太筮屋，11324平方米范围内发掘出数量众多的史前房屋遗址、墓葬及陶、石、铜、玉石器。初步考古结果显示，麦坪或许是4500年前大渡河流域的中心城市。出土文物显示，麦坪文化在很多地方不同于三星堆文化，显示出了自己独特的风貌。这里的房屋遗址数量和种类之多，②无论在横断山区，而且在全国都非常罕见。有专家认为，从考古学上来讲，麦坪遗址的意义甚至大于三星堆遗址。遗憾的是，随着瀑布沟水库的蓄水达到851米时，到今年6月份，③海拔太约830米左右的麦坪村大部分土地将沉人水底，④刚刚重见天日的麦坪遗址也将永远沉入20米深。

①________________________________________________________

②________________________________________________________

③________________________________________________________

④________________________________________________________

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比较感觉、知觉、错觉的区别与联系。

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当我们看电视直播NBA总决赛时是在上午，但“湖人”和“凯尔特人”两个球队却是在当地晚上比赛，形成这种现象的原因是（）

A．地球的公转

B．通讯落后

C．国家间文化的差异

D．两地的时差

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At the public radio station KEXP in Seattle, there’s a simple procedure for evaluating new technology. "We just go ahead and do stuff," says one of the station’s morning disc jockeys. That’s how the quirky station created one of the first music podcasts—without support from major record companies.
A podcast is a digital recording of a radio-style audio program that can be downloaded from the Internet and played on a digital music player. Many podcasters think the technology could revolutionize radio as TiVo did television.
Podcasting is a great way for KEXP to reach thousands of new listeners, especially those outside of Seattle. But the station can’t podcast programs such as John in the morning—a variety of independent and mainstream music—because record companies haven’t provided an easy, affordable way for podcasters to license songs. That’s why most podcasts today are talk radio.
KEXP decided that it couldn’t sit around and wait and wait for a major label to sign off on this. So it invited 14 unsigned or small bands from the Seattle area to contribute songs to a podcast. The station asked a lawyer—a listener who volunteers at the station—to draw up a simple contract for the bands. KEXP did not release numbers but said the podcast was a hit. KEXP is now podcasting some live performances to which it owns the rights.
Since podcasts are recordings, they can be played at any time. Listeners can pause, fast-forward or rewind them. And since podcasts are posted online, listeners can download programs from radio stations and independent broadcasters from all over the world. The podcasts can also be hacked and pirated. An enterprising listener could pull songs out of a podcast and turn them into music files or CDs.
That’s why many record companies say the technology is promising but problematic. But record labels worry that listeners will pirate the songs contained in the downloaded radio shows. For example, OK Go and several other emerging bands with EMI have their own podcasts. But EMI is not ready to approve a blanket podcasting license. "Podcasting is potentially very exciting," says Executive Vice-president Adam Klein. The result: yet another Napster-like standoff over piracy and music rights.

From the last paragraph, we can see that "a blanket podcasting license" is one that ______ .

A．offers protection to a podcasting license

B．gives package protection to all podcasts

C．provides integrated licence to any band

D．grants podcasting license to blank disks

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