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2、对老师有什么期望？希望老师能做些什么？最好有具体的建议。

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1. My sister was fond of reading _____________.

A. stories of children
B. childrens’ stories
C. children stories
D. children’s stories

1. I went to the teacher for ____________ about my study.

A. an advice
B. advice

用N点长矩形窗所设计的FIR滤波器的正肩峰位置为

A. ω=ωc - 2π/N
B. ω=ωc +2π/N

长度为N的汉明窗的窗谱主瓣宽度为

A.2π/N
B. 4π/N
C. 6π/N
D. 8π/N