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琴书类说唱音乐多数曲种采用多人站唱的演出形式。（)

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设f（x)=x/x-1，则当x≠0时且x≠1时，f[1/f（x)]=（)。

氢气瓶为确保通风良好，宜露天存放。

简述简单随机取样。

（英译中)Yet it was a manly face, serious and intelligent, and Chu （朱德) judged him to be in his middle twenties.