Finally hydromining method, an inareawere found through comparison between various mining methods.通过多种采煤方法的试验 、 比较后,找到了一种对复杂煤层适应性较强的采煤方法——水力采煤方法.Borehole hydromining is a kind of safe and efficient new mining method.钻孔水力...
When I was 11 my mother sent me to elocution lessons.在我11岁的时候，妈妈让我去上演说技巧课。With every advantage of lungs and elocution, the effect is vapid.然而,扯着嗓子 、 扬顿挫地朗诵,其结果却是令听者兴味索然.With every advantage of lungs and elocution, the ef...
概述了青金石的产地来源和使用历史.The history of its provenance and application is summarized in this paper.他们是以顺时钟的方向环绕着青金石.They are circling the Lapis Lazuli stone in clockwise direction.他们是以顺时钟的方向环绕著青金石.They are circling the Lazuli st...