Which spread spectru

题目

Which spread spectrum technology does the 802.11b standard define foroperation?()

  • A、IR
  • B、DSSS
  • C、FHSS
  • D、DSSS and FHSS
  • E、IR,FHSS,and DSSS
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相似问题和答案

第1题:

Which of the following data network would you implement if you wanted a wireless network that had a relatively high data rate, but was limited to very short distances?()

A. Broadband personal comm. Service (PCS)

B. Broadband circuit

C. Infrared

D. Spread spectrum

E. Cable


参考答案:C

第2题:

Fire may be spread by which means?

A.Conduction of heat to adjacent surfaces

B.Direct radiation

C.Convection

D.All of the above


正确答案:D
火灾可以通过哪中方式被蔓延?临近表面的热传导,直接辐射,对流

第3题:

__________

[A] spread [B] interference [C] exclusion [D] influence


正确答案:D

第4题:

Spread Spectrum扩展频谱


正确答案: 用于避免干扰和达到较高吞吐率的传送技术。替代单一的载波频率,发送方和接收方协调使用一组频率,既可同时也可从一者改变到另一者。该技术对无线网特别重要。

第5题:

下列期权交易策略中,不属于风险有限、收益也有限的策略的是()。

  • A、看涨期权构成的牛市价差策略(Bull SpreaD)
  • B、看涨期权构成的熊市价差策略(Bear SpreaD)
  • C、看涨期权构成的蝶式价差策略(Butterfly SpreaD)
  • D、看涨期权构成的比率价差策略(CallRatio SpreaD.)

正确答案:D

第6题:

Which spread spectrum technology does the 802.11b standard define for operation()。

A.IR

B.DSSS

C.FHSS

D.DSSS and FHSS

E.IR, FHSS, and DSSS


参考答案:B

第7题:

燃气轮机排气温度分散度(exhaust gas temperature spread(EGT spread))


正确答案: 燃气 透平排气口截面上的排气温度偏差, 用来间接判断高温部件的运行状态。 其中, 燃气 轮机排气温度指的是燃气透平排气口截面上的排气温度。

第8题:

Which software-based security threat is typically spread from user to user via e-mail?()

A.Data interception

B.Virus

C.Trojan horse

D.Denial of service


参考答案:B

第9题:

Which two statements correctly describe the relation between a data file and the logical databasestructures()

  • A、An extent cannot spread across data files.
  • B、A segment cannot spread across data files.
  • C、A data file can belong to only one tablespace.
  • D、A data file can have only one segment created in it.
  • E、A data block can spread across multiple data files as it can consist of multiple operating system (OS) blocks.

正确答案:A,C

第10题:

Which type of database file is spread across all disks in a disk group?()

  • A、 All types of files are spread across all disks in the disk group.
  • B、 Datafiles
  • C、 Redo log files
  • D、 Archived redo log files
  • E、 Control files

正确答案:A

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