secondary anomaly

the appropriate prospecting techniques include geological mapping and trenching, together with geophysical measurement and streaming geochemical secondary anomaly to control the outcrops of the structural rupture zones, and drilling holes for deep control.

本区合适的勘查手段为，地表以地质填图和槽探工程为主，结合物探测量和化探沟系次生晕的勘查方法来控制（矿化）构造蚀变碎裂带地表露头，中深部采用钻探工程。

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nevertheless, negative velocity anomaly regions are mainly seen in the eastern part, with the lowest negative anomaly in the north china block region and secondary low anomaly in the northeastern asia block region.

东部地区速度以负异常为主，华北地块区速度负异常最大，其次是东北亚地块区。

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reason analysis and its countermeasure of generator reverse power protection malfunction caused by the secondary circuit anomaly of voltage transformer

电压互感器二次回路异常引起发电机逆功率保护误动作的原因分析及解决方法

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