Which spread spectrum technology does the 802.11b standard define foroperation？（）A、IRB、DSSSC、FHSSD、DSSS and FHSSE、IR，FHSS，and DSSS
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
相关考题：
Which software－based security threat is typically spread from user to user via e－mail?() A.Data interceptionB.VirusC.Trojan horseD.Denial of service
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 circuitC. InfraredD. Spread spectrumE. Cable
Which spread spectrum technology does the 802.11b standard define for operation()。 A.IRB.DSSSC.FHSSD.DSSS and FHSSE.IR, FHSS, and DSSS
Fire may be spread by which means?A.Conduction of heat to adjacent surfacesB.Direct radiationC.ConvectionD.All of the above
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.）
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.
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、 DatafilesC、 Redo log filesD、 Archived redo log filesE、 Control files
You need to display a very large single-record data block. Since it will be so large, a convenient means of navigation is needed between items. Which type of canvas would you use to display the data block? （）A、Tab canvas. B、Pop up canvas. C、Spread table canvas. D、Vertical toolbar canvas.
单选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.）
单选题Which of the following could be the best title for this passage?AThe Spread of HIV—Will We Ever Cure AIDS?BThe Worse Situation of AIDS—Will AIDS Ruin the Human Race?CThe Statistics of AIDS—Will AIDS Spread around the World?DThe Potential of HIV—Will Asia Become the Core of AIDS?
单选题Fire may be spread by which means?（）AConduction of heat to adjacent surfacesBDirect radiationCConvectionDAll of the above
单选题Which firefighting method is an example of an indirect attack on a fire?（）.ABouncing a straight stream of water off the overhead to create spray effectBSpraying foam on a bulkhead and letting it flow down and over a pool of burning oilCFlooding a paint locker with CO2 and sealing the compartmentDCooling adjacent bulkheads with water to prevent the spread of the fire by conduction
单选题A fire may be spread by which of the following means?（）AConduction of heat to adjacent surfacesBDirect radiationCConvectionDAll of the above
单选题When possible，what is the FIRST step in fighting an engine fuel-pump fire which results from a broken fuel line?（）ASecure all engine room doors，hatches，and ventsBClose the fuel line valveCCheck the spread of the fire with foamDCast the barge off the wharf
单选题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 DatafilesC Redo log filesD Archived redo log filesE Control files
多选题Which two statements correctly describe the relation between a data file and the logical databasestructures（）AAn extent cannot spread across data files.BA segment cannot spread across data files.CA data file can belong to only one tablespace.DA data file can have only one segment created in it.EA data block can spread across multiple data files as it can consist of multiple operating system （OS） blocks.
单选题A Windows 7 user has documents spread throughout multiple hard drives and wishes to organizeand search them in one panel. Which of the following features should they be shown?（）AWindows ExplorerBMy documentsCWindows Desktop Search 4.0DLibraries
单选题Which software-based security threat is typically spread from user to user via e-mail?（）AData interceptionBVirusCTrojan horseDDenial of service
单选题Which spread spectrum technology does the 802.11b standard define for operation（）。AIRBDSSSCFHSSDDSSS and FHSSEIR, FHSS, and DSSS
单选题Which statement is true about a worm attack？（）AHuman interaction is required to facilitate the spread.BThe worm executes arbitrary code and installs copies of itself in the memory of the infected computer.CExtremely large volumes of requests are sent over a network or over the Internet.DData or commands are injected into an existing stream of data. That stream is passed between a client and server application.
单选题According to the passage, Asian civilizations, which were ahead of Europe’s, fell behind because ______.AAsian languages were more difficult to learnBEuropean languages had simple alphabetsCthey didn’t have the technology to spread ideasDpeople’s communication skills were not good enough
单选题You need to recover five data files that are spread across multiple disks. Which initialization parameter should you set to speed up redo application？（）ARECOVERY_PARALLELISMBFAST_START_MTTR_TARGETCLOG_CHECKPOINT_INTERVALDFAST_START_PARALLEL_ROLLBACK
单选题The primary function(s) of an automatic sprinkler system is(are) to（）.Aextinguish the fire which triggers itBlimit the spread of fire and control the amount of heat producedCprotect people in the areas which have sprinkler headsDalert the crew to the fire