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【单选题】
一阶 RC 电路的时间常数 τ 为( )。A.
τ=RC
B.
τ=R/C
C.
τ=C/R
D.
τ=0
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【简答题】Carding is accomplished by ( ) or ( ) .
【单选题】According to the fable Swallows Nest in the Eave, which statement about the swallows is wrong?
A.
They would not stop for the food that dropped in flight.
B.
They preferred living in the forest.
C.
They always put safety as a priority.
D.
They built their nests in the eave.
【单选题】According to the fable Swallows’ Nesting in the Eave, which statement about the swallows is incorrect?
A.
They would not stop for the food that dropped in flight
B.
They preferred living in the forest rather than a town
C.
They always put safety as a priority
D.
They built their nests in the eave
【简答题】有 这篇 文章 三段
【简答题】A．attend B．finish C．1eave D．enjoy
【简答题】Indicate the main objectives of the following processes: opening and cleaning, carding, and combing.
【简答题】Carding / 梳毛
【简答题】文章第三段中描写“流水”和“风”，既有相同点，也有不同处。请结合文章内容作出简要分析。
【多选题】the funtion of carding includes
A.
combing
B.
removing trashes
C.
blending
D.
twisting
E.
drawing
【简答题】文章④⑤⑥三段分别是从那两个角度论述古人读书的？从语义上说，三段是什么关系（3分） 答：_______________________________________________
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