问答题

集水沟坡度允许偏差为（）。

【参考答案】

1~2‰

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Someone is adjusting a guitar. He changes the length of guitar string from L to 0.9L, and the tension in the guitar string from T to 1.1T. After the adjustment, the frequency of guitar will change from f to ______.

A．0.94f
B．0.99f
C．1.17f
D．1.22f

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