magistral

the magistral line of fortifications.

防御工事的线

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.

矿山地质灾害的发生，地质地貌背景是诱发的潜在因素，不合理的开采方法是诱发的导因素，降雨和水文条件是激发灾难发生的直接原因。

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的构建。