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【判断题】
草图中的镜像曲线会保持与源曲线之间关于中心面的对称关系。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】Sally came to China last year. She is now living in Beijing and works in a computer company. She has been in the company for six months. The company is in the north of the city, and her flat is in the...
【简答题】(Você quer informações). Vou enviar __________ informações.
【单选题】She came in for ________ coffee and told me the noise of ________ traffic kept her awake last night. [ ]
A.
a; the
B.
a; /
C.
the; the
D.
the; /
【单选题】Once (giving) (a set of) instructions, a computer can gather (a wide ranger) of informa-tion (for different purposes).
A.
giving
B.
a set of
C.
a wide ranger
D.
for different purposes
【单选题】某连续时间系统的输入x(t) 和输出y(t) 满足y(t)=|x(t)-x(t-1)| ,则该系统为
A.
因果、时变、非线性
B.
非因果、时不变、非线性
C.
非因果、时变、线性
D.
因果、时不变、非线性
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