Results:Compared to the low frequency group, the diagnosis accuracy rate of high frequency group is nearly P >0 05 and the diagnosis accuracy was raised in high low frequency group.
结果：高频组准确率与低频组相近（P>0 .0 5 ） ，高、低频联合检查组确诊率高于低频组（P<0 .0 5 ）。
In the wild, elephants often need to communicate over long distances, using low frequency calls to keep tabs on other members of their group.
在野生环境中，大象经常要在距离很远的时候，彼此进行沟通和交流，这时它们会使用低频叫声和同一象群中的其它成员保持联系。
The low frequency shielding characteristics of a chiral spherical shell is studied and a group of curves for design is given.
分析了手征介质球壳的低频电磁屏蔽效应，给出了一组手征电磁屏蔽球壳的设计曲线。
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