单项选择题

极限 （    ）

A．0
B．
C．
D．
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单项选择题
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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人力作业安全基本要求主要有哪些？
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