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【单选题】
模拟信号是在数值上和时间上都是连续的,以下( )不是模拟信号。A.
正弦波
B.
三角波
C.
矩形波
D.
尖峰波
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反馈参考答案：
举一反三
【单选题】老年人心理健康标准错误的是
A.
能较好地耐受外来事物的刺激
B.
对意外事故能保持理智
C.
对待出现的困难手足无措
D.
还能较快的医治心理创伤
E.
有限度的个性发挥
【简答题】3. Shortly after Christopher was operated on,
__________.A. A) he recovered quickly and went home B. B) he still had some difficulty in breathing C. C) he fell down and broke his arm D. D) his chance...
【单选题】从奥运会吉祥物所反映的内容来看,其设计和产生是
A.
在对本民族优秀传统文化的继承基础上的创新
B.
在灵感基础上的文化创新
C.
本民族文明程度的重要标志
D.
本民族文化的集中体现
【简答题】Last year, I went WWOOFing (Willing Workers on Organic Farms) at a beautiful organic farm in La Réunion. With WWOOFing, volunteers exchange their time and work for food and accommodation. I slept in a...
【单选题】All the doctors insisted that he ___ badly wounded and that he ___ at once.
A.
was… be operated on
B.
were.. must be operated on
C.
was… should be operated
D.
should be…be operated
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