题目内容

Which of the following statements is correct ( )

A. The definition phase results in the Software Requirements Specification
B. Testing is optional in software life cycle
CASE tools can only aid in the design phase of a software life cycle
D. A change during a later phase does not require the documentation of all earlier phases to be up-dated

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在下列叙述中,正确的是( )。

A. Cache的功能全由软件实现
B. Cache的作用是扩大存储器容量
C. 硬磁盘在柱面上有多少个磁道,就有多少个读写磁头
D. 在流水线计算机中,当执行条件转移指令或中断程序时,会影响流水线的效率

In HDLC protocol, when supervisory frame's type code is '00'. About the following state-ments, which is correct ( )

A. receive ready
B. receive not ready
C. reject
D. selective reject

软件测试是软件开发过程中重要且不可缺少的阶段,测试过程中( )是基础测试。

A. 系统测试
B. 集成测试
C. 单元测试
D. 验收测试

There are several periods in a computer, the longest period is ( ).

A. instruction period
B. machine period
C. beat period
D. CPU period

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