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1、李某受非任職單位委托，利用該單位實驗室，實驗材料和技術資料開發(fā)了一項軟件產(chǎn)品。對該軟件的權利歸屬，表達正確的是( )。

A.該項軟件屬于委托單位

B.若該單位與李某對軟件的歸屬有特別約定的，則遵從約定;無約定的，原則上歸屬李某

C.取決該軟件是否屬于該單位分派給劉某的

D.無論劉某與該單位有無特別約定，該軟件都屬于李某

信管網(wǎng)參考答案：B

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2、電話信道的頻率為 0-4kHZ，若信噪比為 30dB，則信道容量為(1)kb/s，要達到此容量，至少需要(2)個信號狀態(tài)。

(1)A.4

B.20

C.40

D.80

(2)A.4

B.8

C.16

D.32

信管網(wǎng)參考答案：C、D

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3、4B/5B編碼先將數(shù)據(jù)按 4 位分組，將每個分組映射到 5 單位的代碼，然后采用()進行編碼。

A.PCM

B.Manchester

C.QAM

D.NRZ-I

信管網(wǎng)參考答案：D

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4、 ieee 802.16工作組提出的無線接入系統(tǒng)空中接口標準是( )。

A、gprs

B、umb

C、lte

D、wimax

信管網(wǎng)參考答案：D

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5、 the tcp protocolis a (1) layer protocol. each connection connects two tcps that may be just one physical network apart or located on opposite sides ofthe globe. in other words, each connection creates a (2) witha length that may be totally different from another path created by another connection. this means that tcp cannot use the same retransmission time for all connections. selecting afixed retransnussion time for all connections can result in serious consequences. ifthe retransmission time does not allow enough time for a (3) to reach the destination and an acknowledgment to reach the source, it can result in retransmission of segments that are still on the way. conversely, if the retransnussion time is longer than necessary for a short path, it may result in delay for the application programs.even for one single connection, the retransmission time should not be fixed.a connection may be able to send segments and receive (4)faster during nontraffic period than during congested periods. tcp uses the dynamic retransmission time,a transmission time is different for each connection and which may be changed during the same connection. retransmission time can be made(5) by basing it on the round-trip time (rtt). several formulas are used for this purpose.

(1)A、physical

B、network

C、transport

D、application

(2)A、path

B、window

C、response

D、process

(3)A、process

B、segment

C、program

D、user

(4)A、connections

B、requests

C、acknowledgments

D、datagrams

(5)A、long

B、short

C、fixed

D、dynamic

信管網(wǎng)參考答案：C、A、B、C、D

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