And study the classification system application in diagnosing the caving and drawing characteristics of top-coal, choosing support and designing drawing mechanism.
同时研究本分类系统软件在综采放顶煤工作面顶煤的可放性诊断、支架选型和放煤机构设计中的应用。
By drawing upon some of the distinctive characteristics of high-technology industries, an attempt is made to identify possible elements of a future scenario.
通过利用高技术工业的一些显著特点，试图确定未来设想的可能因素。
Through various drawing methods and annealing steps, We produces different physical characteristics in wire of a given size.
通过各种绘图方法和退火步骤，我们产生不同的物理特性，在一个给定大小的丝。
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