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1、李某受非任职单位委托，利用该单位实验室，实验材料和技术资料开发了一项软件产品。对该软件的权利归属，表达正确的是( )。

A.该项软件属于委托单位

B.若该单位与李某对软件的归属有特别约定的，则遵从约定;无约定的，原则上归属李某

C.取决该软件是否属于该单位分派给刘某的

D.无论刘某与该单位有无特别约定，该软件都属于李某

信管网参考答案：B

查看解析：www.cnitpm.com/st/4184127124.html

2、电话信道的频率为 0-4kHZ，若信噪比为 30dB，则信道容量为(1)kb/s，要达到此容量，至少需要(2)个信号状态。

(1)A.4

B.20

C.40

D.80

(2)A.4

B.8

C.16

D.32

信管网参考答案：C、D

查看解析：www.cnitpm.com/st/3938911557.html

3、4B/5B编码先将数据按 4 位分组，将每个分组映射到 5 单位的代码，然后采用()进行编码。

A.PCM

B.Manchester

C.QAM

D.NRZ-I

信管网参考答案：D

查看解析：www.cnitpm.com/st/393901223.html

4、 ieee 802.16工作组提出的无线接入系统空中接口标准是( )。

A、gprs

B、umb

C、lte

D、wimax

信管网参考答案：D

查看解析：www.cnitpm.com/st/92783194.html

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

信管网参考答案：C、A、B、C、D

查看解析：www.cnitpm.com/st/92823196.html