东沙高磁异常含一定的高频成份，与新生代玄武岩及中生代岩浆岩有关，而其低频成份可能反映了发育的下地壳高速层。
The high frequency part of Dongsha high-value magnetic anomaly may be related with Cenozoic basalt and Mesozoic magmatic rocks, and the low frequency part developing high-velocity lower crust.
QS 28装备了2只18英寸精密低频换能器。可获得高灵敏度以及对快速的瞬间峰值给出异常响应。
QS28 is equipped with two 18-inch low frequency transducer precision. Obtain high sensitivity and fast transient peak of the abnormal response is given.
介绍了大型汽轮发电机组频率异常运行的危害和对低频保护的技术要求及准则；
The paper introduced the hazard of large turbine generator operation under abnormal frequency and technical requirements and criteria for low frequency protection.
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