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【多选题】
以下对控制系统的描述正确的是：（）A.
各性能指标的要求间往往相互矛盾，必须兼顾
B.
确定性能指标时要求越高越好
C.
希望最大超调量小一点，振荡次数少一点，调整时间少一点，稳态误差小一点
D.
惯性环节的时间常数越大，对系统的快速性和稳定性越不利
E.
系统增益加大，稳态性能改善，但稳定性一定变差
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【简答题】将工作表标题跨列合并后居中并适当调整其字体、加大字号,并改变字体颜色。适当加大数据表行高和列宽,设置对齐方式及销售额数据列的数值格式(保留2位小数),并为数据区域增加边框线。
【单选题】What was the thing that he was never able to remember?
A.
What happened immediately before or during the accident.
B.
What he had done for ten weeks after the accident.
C.
All of the previous years before the accident.
D.
His way round the village itself.
【单选题】设A是n阶方针,A经过若干次初等列变换变为B,则( )。
A.
B.
存在可逆矩阵P,使得PA=B
C.
存在可逆矩阵P,使得PB=A
D.
存在可逆矩阵P,使得BP=A
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【单选题】---Whose badminton racket is this? It looks nice. How much is it _______? ---Sorry, I don’t know.
A.
cost
B.
pay
C.
spend
D.
worth
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