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某计算机有14条指令,其使用频度分别如下表所示;
I1 0.15
I2 0.15
I3 0.14
I4 0.13
I5 0.12
I6 0.11
I7 0.04
I8 0.04
I9 0.03
I10 0.03
这14条指令的指令操作码用等长码方式编码,其编码的码长至少为(1)位。若只用两种码长的扩展操作码编码,其平均码长至少为(2)位。
(1)A、3
B、4
C、5
D、6
(2)A、2.8&nbs
Certificates are (1) documents attesting to the (2) of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to (3)someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a certificate also contains an (4)date, the name of the CA that issued the certificate, a serial number, and perhaps other in
第7题: 网络安全体系设计可从物理线路安全、网络安全、系统安全、应用安全等方面来进行。其中,数据库容灾属于( )
A、物理线路安全和网络安全
B、物理线路安全和应用安全
C、系统安全和网络安全
D、系统安全和应用安全
The Rational Unified Process (RUP) is a software engineering process, which captures many of best practices in modern software development. The notions of (1) and scenarios have been proven to be an excellent way to capture function requirements. RUP can be described in two dimensions – time and content. In the time dimension, the software lifecycle is broken into cycles. Each cycle is divided into four consecutive (2) which is concluded with a well-defined (3)
第61题: 一个局域网中某台主机的IP 地址为176.68.160.12,使用22 位作为网络地址,那么该局域网的子网掩码为(1),最多可以连接的主机数为(2)。
(1)A、255.255.255.0
B、255.255.248.0
C、255.255.252.0
D、255.255.0.0
(2)A、254
B、512
C、1022
D、1024