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.

矿山地质灾害发生，地质地貌背景是诱发潜在因素，不开采方法是诱发主导因素，降和水文条件是激发灾难发生因。

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。