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【单选题】
离散时间系统，系统函数收敛域∞≥∣z∣＞2，则系统为（）A.
稳定的因果系统
B.
不稳定的因果系统
C.
稳定的非因果系统
D.
不稳定的非因果系统
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举一反三
【简答题】发送电子邮件时需要建立连接,发送完后将连接断开,这种发送方式是由哪一层决定的
【单选题】听力原文：W: You didn't have too much trouble fixing your car engine, did you? M: It only took me most of the day. Q: What does the man mean? (15)
A.
He had no time fixing his car engine.
B.
Fixing his car engine took him a lot of time.
C.
He only fixed part of his car engine.
D.
His car engine turned out well.
【单选题】You must have been there, ____________?
A.
have you
B.
did you
C.
haven’t you
D.
didn’t you
【单选题】下列对文中相关内容的的解说,不正确的一项是
A.
“贞观”，是唐朝君王唐太宗李世民的年号。年号，是我国封建社会主要用来纪年的名号，首创于汉武帝，一个皇帝有一个年号，也可以有多个年号。
B.
“屯田”，我国历代封建王朝组织劳动者在官地上进行开垦耕作的农业生产组织形武，有军屯与民屯之分，以军屯为主。
C.
“谥”，即谥号，古代君主、诸侯、大臣、后妃等具有一定地位的人死去之后，根据他们的生平事迹与品德修养，给予褒扬的一个称号。
D.
“陪葬”，古代丧葬习俗，既指人、俑或物品陪同死者一起埋葬，也指臣子或妻妾的灵柩葬在帝王或丈夫的墓旁；这里指张延师死后葬在昭陵旁。
【简答题】C Isn't it astonishing how much time we spend talking about food? “Have you ever eaten …?” “What did you have for lunch?” and so on. And yet when you travel from one country to another, you will find ...
【单选题】Woman: Did you have much trouble with the exam? Man: Not really. Question: How was the man doing with the exam?
A.
He didn't have much trouble.
B.
He is sure that he did perfectly in the exam.
C.
He did very badly in the exam.
D.
He didn't take the exam.
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