4G is one of those terms that keep coming back through marketing brochures for what the latest technologies happen to be in the cellphone market. Every carrier claims to have true 4G, and has been claiming that for years, regardless of what they actually

题目

4G is one of those terms that keep coming back through marketing brochures for what the latest technologies happen to be in the cellphone market. Every carrier claims to have true 4G, and has been claiming that for years, regardless of what they actually use. The reason was simple because the real 4G specification, expected to be drafted by the International Telecommunication Union, was no where to be found. In fact, the ITU took way longer than being expected to come up with a decision, likely because of massive lobbying campaigns. After all, which company wants to have to redesign its entire network just to be able to keep saying they are 4G? Now however, they ITU has decided itself.What does this mean for carriers and users? First，let’s see what 4G really is. As expected, LTE is central to the ITU strategy,but more precisely,the organization went with LTE-Advanced,which is a stricter version of traditional LTE. To qualify as 4G，a network has to provide 100Mbps connections over wireless,and 1 Gbps over wired. The whole network has to be fully IPv6 compliant. Frequencies have to be variable over 40MHz to avoid interference. Finally, global roaming has to be seamless, along with transitions between wirless and wired connections. This is a real step forward, and a good decision, which ensures that real 4G services will meet a good level of services. Technically, LTE-Advanced is just one of two new standard that are now under the umbrella called IMT-Advanced. The other one is WiMAX 2 which is a further refinement of the WimMAX protocol. Based on the paragraph above，to qualify as 4G, a network has to satisfy （） criteria. The transitions between wireless and wired connections have to be （）. LTE-Advanced is a standard belonging to （）.

A．two B．three C．four D．five A．limited B．possible C．seamless D．deployed A．WiMAX B．WiMAX 2 C．IPv6 D．IMT-Advanced

相似考题

1.We look forward to()to his wedding ceremony.A. have comeB. comeC. coming

2.Look! Here ______ the famous player.A、comesB、comeC、had comeD、coming

3.Here() the busA、comesB、comeC、will comeD、coming

4.I hear Mary ________ back in two days.A.comesB.comeC.will comeD.coming

参考答案和解析
正确答案：D,C,D
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    下列哪种缓存工作模式,在磁盘阵列供电故障时,不会影响硬盘上存储数据的完整性和一致性()

    A.Write-through透写模式

    B.RAID5方式

    C.共享缓存方式

    D.Write-back回写模式


    答案：A

  • 第2题：

    In some countries, _____ is called "equality" does not really mean equal rights for all people.

    (A) which (C) that

    (B) what (D) one

     

     


    选B


    这句话貌似定语从句。而实际上，前面的部分就是状语，后半句与countries没有修饰关系（因为1.后半句缺主语，但空格的位置用countries不能替换，否则语义不对。2.后半句不缺宾语。）所以后半句的（)is called equality作主语.是主语从句。
    在选项中，只有what引导主语从句。
    意思：在一些国家里，所谓平等，并不意味着所有公民的平等权利

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    价格；条款；花费（　　）。
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    B.price；spend；terms
    C.price；terms；spend
    D.terms；price；spend


    答案：C
    解析：

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    We may learn from Paragraph 4 that department stores were advised ________.

    A focuses on infant wear and older kids' clothes

    B attach equal importance to different genders

    C classify consumers into smaller groups

    D create some common shoppers' terms


    正确答案：C

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    assuming the default switch configuration which vlan range can be added modified and removed on a cisco switch?()

    A.2 through 1001

    B.1 through 1001

    C.1 through 1002

    D.2 through 1005


    参考答案：A

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    3、根据含糖量分类，干型葡萄酒糖度 。 A、＜4g/L B、4g/L-12g/L C、12g/L-50g/L D、＞50g/L

    A．＜4g/L

    B．4g/L-12g/L

    C．12g/L-50g/L

    D．＞50g/L


    正确

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