In this longitudinal study, 4, 689 Iceland residents aged 33to 65 first participated in a population study and were questionedabout frequency of headaches and symptoms.

在这个纵向研究中，有4，689名冰岛居民，年龄在33到65岁之间，首次参与到人口研究中来，进行关于频发头痛及症状的调查。

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A lot of subjects such as the difference between longitudinal and transverse conductivity, proton compensate, frequency response, and sample geometry etc, remained for further study.

但测试过程中还有许多问题有待进一步研究，如膜的纵向与横向电阻的差别、质子补偿、膜的频率响应特性、测试几何尺寸的影响等。

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Based on equivalent four-terminal networks of the longitudinal ultrasonic transformer, the resonant frequency equation and the amplitude magnification coefficient, with reactive load, are studied.

在负载为纯力抗的状况下，利用纵振型变幅杆等效四端网络，对频率方程和放大系数进行了研究。

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