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Spread spectrum simply means that data is sent in small pieces Over a number of the(46)frequencies available for use at any time in the specified range. Devices using(47)spread spectrum (DSSS)communicate by(48)each byte of data into several parts and sending them concurrently on different(49). DSSS uses a lot of the available(50), about 22 megahertz (MHz).
A．continuous
B．high
C．low
D．discrete
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更多 “ Spread spectrum simply means that data is sent in small pieces Over a number of the(46)frequencies available for use at any time in the specified range. Devices using(47)spread spectrum (DSSS)communicate by(48)each byte of data into several parts and sending them concurrently on different(49). DSSS uses a lot of the available(50), about 22 megahertz (MHz).A．continuousB．highC．lowD．discrete ” 相关考题
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根据下面的文字资料回答 71～75 题 In the following essay．each blank has four choices．Choose the best answer and write down on the answer sheet．Spread spectrum simply means that data is sent in（ 1 ）pieces over a number of the discrete frequencies available for use at any time in the specified range．Devices using（ 2 ） spread spectrum(DSSS)communicate by splitting each（ 3 ）of data into several parts and sending them concurrently on different（ 4 ），DSSS uses a lot of the available（ 5 ），about 22 megahertz(MHz)．第71题：文中（ 1 ）处正确的答案是（ ）。A．smallB．highC．lowD．long
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●In the following essay，each blank has four choices．Choose the best answer and write down on the answer sheet．Spread spectrum simply means that data is sent in (66) pieces over a number of the discrete frequencies available for use at any time in the specified range．Devices using (67) spread spectrum(DSSS)communicate by splitting each (68) of data into several parts and sending them concurrently on different (69) ,DSSS uses a lot of the available (70) ，about 22 megahertz(MHz)．(66) A．smallB．highC．lowD．long(67) A．direct-sequenceB．discrete-sequenceC．duplicate-sequenceD．dedicate-sequence(68) A．dataB．byteC．packetD．bit(69) A．bitsB．frequenciesC．packetsD．messages(70) A．rateB．velocityC．bandwidthD．period
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In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.Spread spectrum simply means that data is sent in(66)pieces over a number of the discrete frequencies available for use at any time in the specified range. Devices using(67) spread spectrum (DSSS)communicate by splitting each(68)of data into several parts and sending them concurrently on different (69), DSSS uses a lot of the available(70), about 22 megahertz (MHz).A．smallB．highC．lowD．long
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Which spread spectrum technology does the 802.11b standard define for operation()。
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Which spread spectrum technology does the 802.11b standard define foroperation？（）A、IRB、DSSSC、FHSSD、DSSS and FHSSE、IR，FHSS，and DSSS
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单选题If voice and data traffic will be sent and received via a WAN links， what must be configured to provide a certain amount of dedicated bandwidth and to prioritize the voice traffic over other types of network traffic？（）A
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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.
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单选题Which spread spectrum technology does the 802.11b standard define for operation（）。A
IRB
DSSSC
FHSSD
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单选题Which statement is true about a worm attack？（）A
Human interaction is required to facilitate the spread.B
The worm executes arbitrary code and installs copies of itself in the memory of the infected computer.C
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unit methodB
block methodC
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单选题“The city grew outward instead of upward” (Para. 2) means _____.A
the city became more spread out instead of growing tallerB
there were fewer small houses than tall buildingsC
rapid development took place in the city centerD
many tall buildings could be found in the city
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