the utility model has the advantages that the roller vegetable skewer saves labor and time, has high vegetable hole digging efficiency and simple structure and is economic and practical.
本实 用新型的有益效果是,节省人力和时间,挖菜穴的效率高,结构简单,经济实 用。
introduced some experiments for how to increase specific digging efficiency of combine mechanized heading.
介绍了提高综掘单进水平的几点经验。
the article introduces how to improve the digging efficiency of the working face of stone head in minefield, and discusses the measures to improve the construction schedule of stone head by examples.
介绍了如何提高矿区巖巷工作面的掘进工效,运用实例说明了提高巷道施工进度的对策。