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【单选题】
Select the statement that you agree with the most
A.
As far as world affairs are concerned, most of us are the victims of forces we can neither understand, nor control.
B.
By taking an active part in political and social affairs the people can control world events.
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【简答题】函数y=2sinx的最小正周期是______.
【单选题】When Mary received the life-changing news, she __.
A.
lost control of herself
B.
began a balanced diet
C.
Med to get a treatment
D.
behaved in an adult way
【单选题】双作用式单活塞杆液压缸
A.
活塞两个方向的作用力相等
B.
往复运动的范围约为有效行程的3倍
C.
活塞有效作用面积为活塞杆面积的2倍时,工作台往复运动速度相等
D.
常用于实现机床的工作进给和快速退回
【单选题】函数y=2sinx 的最小正周期是
A.
4
B.
2
C.
【简答题】When my daughter was five, we gave her a piano as her birthday gift, with great excitement; she began learning piano under the teacher’s guidance. However, when she was no longer curious about it, she...
【单选题】由离散时间差分方程所 描述的系统为( ) 。
A.
IIR (无限长脉冲响应)系统
B.
FIR(有限长脉冲响应)系统
C.
因果系统
D.
非稳定系统
【单选题】方程 所描述的系统为( )
A.
非线性时不变因果系统
B.
线性时不变因果系统
C.
非线性时变非因果系统
D.
线性时变非因果系统
【单选题】下列微分方程所描述的系统为线性时不变系统的是( )
A.
y''(t) + y'(t)y(t) = f(t)
B.
y'(t) + 2y(t) = f(-t)
C.
y'(t) +3y(t) = f'(t) + 2f(t)
D.
y'(t) + 2y(t) = |f(t)|
【单选题】微分方程 所描述的系统为 ( )
A.
时不变因果系统
B.
时不变非因果系统
C.
时变因果系统
D.
时变非因果系统
【单选题】函数y=2sinx的最小正周期是
A.
B.
C.
π
D.
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