证明:当0<a<b<π时,6sinb+2cosb+πb>asina+2cosa+πa

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问题:

证明:当0<a<b<π时,6sinb+2cosb+πb>asina+2cosa+πa.

考点:普通考研考研数学(三)考研数学三
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电信运营口商为客房提供详细计费清蚁,此项服务属于通信服务产品整体概念中的(  )。

A.核心产品 

B.层次产品 

C.形式产品

D.附加产品

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在服装设计中,()常常出现于表演装、创意装等的设计。夸张的巧妙使用,可以突出情趣,吸引注意力,更好地表达设计师的创作意图,取得意想不到的效果。

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阅读理解。

     Kelly Reeves was getting ready for a trip when her phone slipped into a sink full of water. Panic

moment! She quickly picked up the wet phone and tried to turn it on, but nothing worked. Her first

reaction? She got dressed, drove to the nearest store, and bought a new model at full price.    

     A new study finds that fear of losing your phone is a common illness. About 66 percent of those

surveyed suffer from nomophobia or "no mobile phone phobia". Interestingly, more women worry

about losing their phone than men.    

     Fortunately, there's a solution.    

     The first step is to figure out if you have nomophobia. Checking your phone too often is one

thing,but the true sign of a problem is that you can't conduct business or go about your routine when

the fear becomes so severe.    

     Do you go to unusual lengths to make sure you have your phone? That's another sign of a

problem.If you find you check your phone plenty of times per hour, or a total of an hour per day,

there may be a problem.    

     Some of the treatments are similar to those for treating anxiety attacks: Leaving the phone behind

and not checking e-mail or text messages, and then learning to tolerate the after anxiety. Even if this

leads to a high level of worry and stress, the solution is to push through the fear and learn to deal

with not having your phone.    

     Of course, there are also technological alternatives. Luis Levy, a co-founder at Novy PR, says

he uses an application called Cerberus that can automatically track the location of his phone. To

find it, he can just go to a Web site and see the phone's location.    

     He also insures his phone through a service called Asurion. The company's description of its

product reads like a prescription for anxiety: "60 million phones are lost, stolen or damaged each

year. You'll have complete peace of mind knowing that your phone is protected and you can

quickly reconnect with family, friends and work, as soon as the very next day!"

1. Why does the author mention Kelly's experience in the first paragraph?

A. To introduce the topic for discussion.

B. To inform us that mobile phones are useful.

C. To warn us that we should be careful.

D. To tell us we should get phones ready for a trip.

2. The underlined word "nomophobia" in Paragraph 2 means ________.

A. Habits of using mobile phones.

B. Fear of losing mobile phones.

C. Eagerness for new mobile phones.

D. Independence of mobile phones.

3. Which of the following is a way to treat nomophobia?

A. Avoiding using phone for some time

B. Learning more about modern technology.

C. Protecting one's phone against any damage.

D. Not using a mobile phone in one's daily work.

4. Why can the service called Asurion help to treat nomophobia?

A. It lets you know other people also lose their phones.

B. It will give you a new phone through insurance.

C. It enables you to reconnect with your acquaintance.

D. It gives you a prescription to treat nomophobia.

5. What is the passage mainly about?

A. Attitude toward mobile phone.

B. New mobile phone technology.

C. Disadvantages of mobile phone.

D. Solutions to nomophobia

题型:问答题

辐射防护的目的之一在于防止有害的()的发生。

A.躯体效应

B.随机性效应

C.遗传效应

D.确定性效应

题型:问答题

应收账款账户借方登记的是应收款项的增加数。 ( )

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