单项选择题

设A、B、C、D为任意集合,下面命题中为假的是

A.A-B=B当且仅当A=B=ф
B.若A
SB∧C
D,则(A∪C)
(B∪D)
C.A-(B∪C)=(A-B)∩(A-C)
D.若A
B∧C
D,则(A∪C)
(B∪D)
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单项选择题
Which of the following statements is correct
A.The definition phase results in the Software Requirements Specificatio
B.Testing is optional in software life cycl
C.CASE tools can only aid in the design phase of a software life cycl
D.A change during a later phase does not require the documentation of all earlier phases to be update
单项选择题
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
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