magistral

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.

矿山地质灾害生，地质地貌背景潜在因素，不合理开采方法主导因素，降和水文条件灾难生直接原因。

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构建。