the magistral line of fortifications.
防御工事
the magistral line of fortifications.
防御工事
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.
山地质灾害
发生,地质地貌背景是诱发
潜在因素,不合理
开采方法是诱发
导因素,降雨和水文条件是激发灾难发生
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构建。
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