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【单选题】
集成运算放大器实现信号运算关系时,其电路的特点是:( )
A.
电路引入负反馈
B.
电路引入正反馈
C.
电路可引入正反馈,也可引入负反馈
D.
不需要引入反馈
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【单选题】二阶系统的传递函数为 ,其无阻尼固有频率为 ( )。
A.
4
B.
2
C.
0.5
D.
0.2
【单选题】某 二阶系统的传递函数为 ,则其无阻尼固有频率 为 ( ) 。
A.
0.25
B.
0.5
C.
1
D.
4
【简答题】( ) 10. Did you catch the first bus thismorning? No, I didn’t If you ___ earlier, you ___ the bus.A. got up; would catch B. should get up; would catch C. had got up; would have caught D. had got up; w...
【简答题】小刚有15个苹果,分了 给小敏,小敏分得几个苹果?
【单选题】工化 2.2.2 下列离子晶体中熔点最高的是 ( )。
A.
CaF 2
B.
CaO
C.
CaCl 2
D.
BaO
【简答题】根据文章上下文,将A-F填入下列横线中 A.What plan do you suggest? B.What would you do in my situation? C.You could always start with an exercise programme. D.Maybe Advice you should join them. E.If I were you, I’d star...
【单选题】---- Did you catch the first bus this morning? ---- If I ___________ earlier, I ___________ the bus.
A.
got up; would catch
B.
should get up; could catch
C.
had got up; would have caught
D.
had got up; would catch
【单选题】十字花科植物的雄蕊都是 ( )。
A.
四强雄蕊
B.
二强雄蕊
C.
单体雄蕊
D.
聚药雄蕊
【单选题】下面说法错误的是( )。
A.
冬瓜、西瓜、南瓜、苦瓜都是葫芦科植物
B.
芥菜、荠菜、甘蓝、紫罗兰都是十字花科植物
C.
陆地棉、锦葵、向日葵、朱槿都是锦葵科植物
D.
栝楼和蒲公英虽不同科,但都有聚药雄蕊
【单选题】有二阶系统的传递函数为 ,则其无阻尼固有频率和 阻尼比 依次为 ( ) 。
A.
2,1
B.
2,2
C.
1,0.5
D.
0.5,1
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