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【简答题】
In this section, you will hear two dialogues. In dialogue 1, you will learn how to recommend different ticket types to passengers. In dialogue 2, you will learn how to explain the ticket fare. Dialogue 1 Situation: A tourist to Guangzhou wants to know the suitable ticket for him during his stay. He approaches the ticket office for help. In the following dialogue, T is short for tourist while C is short for clerk. T: Excuse me, could you please help me explain the (1) ? C: Yes, certainly. Currently, the subway station offers three major ticket types to passengers, including (2) ticket, Yang Cheng Tong Card and stored-value card. T: All right. Single-trip ticket is only (3) for a single trip for the day it is purchased, am I right? C: Yes. And you can buy it yourself on the (4) over there. T: I’d rather not. There are always crowds of people in front of the machine. So if I would be using the subway more often, the Yang Cheng Tong Card or the stored-value card are smarter options, I suppose? C: Certainly, sir. And ... you are a backpacker, am I right? T: You bet. C: In your case, I recommend the (5) card. Currently, we now offer One-Day Pass and Three-Day Pass. Each can be used without limit within a day or three days. T: That sounds nice since I’ll be in Guangzhou for three days. How much is the Three-Day Pass? And do I need to pay a deposit? C: The Three-Day Pass costs 50 Yuan. And there’s no need to pay a (6) . T: OK. I think I’ll get one.
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【单选题】余弦函数的自相关函数是()。
A.
同频余弦信号
B.
脉冲信号
C.
偶函数
D.
正弦信号
【单选题】正弦信号的自相关函数是 。
A.
同频率的余弦信号
B.
脉冲信号
C.
正弦信号
D.
奇函数
【单选题】已知某电压比较器的电压传输特性如图,输入波形如图中所示,下图电路的输出波形为()
A.
B.
C.
D.
D
【单选题】输入波形如图中所示,下图电路的输出波形为()
A.
B.
C.
D.
D
【单选题】正弦信号的自相关函数是:
A.
同频余弦信号
B.
脉冲信号
C.
随机信号
D.
不能确定
【单选题】正弦信号的自相关函数是()
A.
正弦信号
B.
余弦信号
C.
偶函数
D.
同频余弦信号
【判断题】正弦信号的自相关函数是同频率的余弦函数。
A.
正确
B.
错误
【多选题】测得某信号的相关函数为一余弦曲线,则其______是正弦信号的______。
A.
可能    
B.
不可能    
C.
必定    
D.
自相关函数
E.
互相关函数
【单选题】已知某电压比较器的电压传输特性如图,输入波形如图中所示,下图电路的输出波形为()
A.
B.
C.
D.
D
【单选题】已知某电压比较器的电压传输特性如图,输入波形如图中所示,下图电路的输出波形为()
A.
B.
C.
D.
D
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