It even results in geologic hazard;for the mine geologic hazard,the background of physiognomy is the potential factor,while the irrational exploitation is the magistral factor.

矿山地质灾害的生，地质地貌背景的潜在，合理的采方法的主导，降雨和水文条件激灾难生的直接原。

Chapter four is the research on diversity architectures of agriculture technique extension mode, analyzing the necessity that diversified mode constuct. several magistral modes is comparative studied.

第四章,多元化农业技术推广模式的构建。