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【单选题】
下列是用来反应衡量通信系统传输消息的质量问题的是A.
有效性
B.
适应性
C.
可靠性
D.
保密性
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举一反三
【单选题】It's reported that CCTV 3 _____ the concert to be held this weekend. [ ]
A.
will cover live
B.
would cover live
C.
will be covered live
D.
would be cover live
【单选题】It's reported that by the end of the month the output of cement in the factory ______ about 10%.
A.
will have risen
B.
has risen
C.
will be rising
D.
has been rising
【单选题】It's reported that by the end of this month the output of cement (水泥) in the factory by about 10%.
A.
will have risen
B.
rises
C.
will be rising
D.
has been rising
【单选题】— Is he coming? — It all ____ the weather. It's reported that it may rain. [ ]
A.
takes on
B.
gets on
C.
depends on
D.
turns on
【简答题】对于线性定常连续系统,非齐次状态方程的解由两部分组成,一是当初始状态为零即X(t0)=0时,由输入U(t)≠0单独作用所产生的解,称为()(填零输入或零状态)响应;二是当输入U(t)=0时,由非零初始状态X(t0)≠0单独作用产生的解,称为()(填零输入或零状态)响应,此结论说明,非齐次状态方程的解满足线性系统的()原理。
【单选题】It's reported that by the end of last month the sale of the company ______ by 10%.
A.
has risen
B.
had been rising
C.
had risen
D.
has been rising
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