已知调制信号m(t)=cos(2000πt)+cos(4000πt),载波为cos104πt,进行单边带调制,试确定该单边带信号的表示式,并
已知调制信号m(t)=cos(2000πt)+cos(4000πt),载波为cos104πt,进行单边带调制,试确定该单边带信号的表示式,并画出频谱图。
已知调制信号m(t)=cos(2000πt)+cos(4000πt),载波为cos104πt,进行单边带调制,试确定该单边带信号的表示式,并画出频谱图。
第1题
This box is too heavy, ________ give me a hand?
A) would you mind
B) would you please
C) will you like to
D) will you please to
第2题
Would you please pass me the salt?
___________.
A:Give you
B:No salt
C:Here they are
D:Certainly. Here you are
第3题
The box is too heavy; ___ give me a hand.
A、would you mind
B、would you please
C、will you like to
D、will you please to
第4题
A) would you mind B) would you please
C) will you like to D) will you please to
第5题
A) would you mind B) would you please
C) will you like to D) will you please to
第6题
听力原文:Would you please give me the report, Tom?
(3)
A.Let's go.
B.Don't mention it.
C.It's delicious.
D.Here you are.
第7题
听力原文:M: Would you pass me the sports section,please?
W: Sure,if you give me the classified ads local news section.
Q: What are the speakers doing?
(15)
A.Talking about sports.
B.Writing up local news.
C.Reading newspapers.
D.Putting up advertisements.
第8题
听力原文:W: Excuse me, sir. How do you wish to draw your money?
M: Would you please give me hundred-yuan notes and the rest in small change?
Q: Where is the conversation taking place?
(14)
A.In a department store.
B.In a hotel.
C.At the customs office.
D.In a bank.
第9题
听力原文:M: Would you pass me the sports section please?
W: Sure. If you give me the classic file in the editorial section?
Q: What are the people doing?
(15)
A.Looking in the library card catalog.
B.Studying for an exam.
C.Reading the newspaper.
D.Exercising in the gym.
第10题
A.Would you please give me a hand
B.Would you please not to bother me
C.Have you ever learned how to do it
D.Would you like to try it
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!