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【多选题】
已知系统结构如下图所示，采样周期T = 0.25秒，【图片】，符合系统描述的为（ ）【图片】A.
系统的开环脉冲传递函数
B.
系统的开环脉冲传递函数
C.
时，系统稳定
D.
时，系统稳定
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反馈参考答案：
举一反三
【单选题】What does the author imply in the last paragraph?
A.
People should not focus on climate change.
B.
People should not blame carbon dioxide any more.
C.
People should not overstate climate change.
D.
People should not worry about extreme weather.
【单选题】What does the woman say about stamp collection?
A.
She started collecting stamps from her childhood.
B.
A good stamp collection can be built in a short time.
C.
A rare set of stamps is worth a lot of money.
D.
It is nearly impossible to collect a rare set of stamps.
【单选题】In which of the following paragraph(s) does the author tell us what to say to encourage children in a science discussion?
A.
The second and third.
B.
The fourth and fifth.
C.
The fifth and sixth.
D.
The seventh.
【单选题】What does the author try to express in the last paragraph?
A.
Difficulties in raising her children.
B.
Worries about what to buy for kids.
C.
Gratitude to Twist for her role.
D.
Concerns about schooling and religion.
【单选题】What does xing of Chinese scripts refer to?
A.
The regular script.
B.
The clerical script.
C.
The cursive hand.
D.
The running hand.
【简答题】属于,适合放在(某处) v —————— .
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