A．SELECT*FROM R WHERE E＜'2'
B．SELECT B,E FROM R WHERE E＜'2'
C．SELECT B,E FROM R HAVING E＜'2'
D．SELECT*FROM R WHERE'5'＜B
有疑问？点此联系我们
收藏该题
查看答案
A．SELECT*FROM R WHERE E＜'2'
B．SELECT B,E FROM R WHERE E＜'2'
C．SELECT B,E FROM R HAVING E＜'2'
D．SELECT*FROM R WHERE'5'＜B
A．a+b+c*d
B．(a+b)*c+d
C．(a+b)*(c+d)
D．a+b*c+d
A．read
B．write
C．draw
D．fill
以下说法错误的是(20)。
A．对象具有很强的表达能力和描述功能
B．对象是人们要进行研究的任何事务
C．对象是封装的最基本单位
D．类封装比对象封装更具体、更细致
某系统总线的一个总线周期包含4个时钟周期，每个总线周期中可以传送64位数据。若总线的时钟频率为44MHZ，则总线带宽为(43)。
A．132MB/s
B．88MB/s
C．44MB/s
D．396MB/s
Sequential circuit is a common logic device whose output values, at a given instant, depend upon its input values and the internal state at that instant, and whose internal state depends upon the(66)preceding input values and the preceding internal state. A sequential circuit can assume a finite number of internal states and may therefore be regarded, from an abstract(67), as a finite(68).Combinational circuit is another logic device whose output values, at any given instant, depend upon the input values at that instant. A combinational circuit is a(69)of a sequential circuit whose internal state is not taken(70).
A．directly
B．immediately
C．instantly
D．snapshot