The author introduces information on the development of medium size(5-10 kVA)3-phase PFC technology.
对于不同功率容量的装置,其采用的PFC技术都有各自的特点,文章介绍了当前中等容量(5～10kVA)三相PFC技术发展的一些情况。
Vocational Guide in Secondary Vocational School;
中等职业学校职业指导刍议
For medium-thick and moderately stable ore- body,being laid preliminary projects in ore block footwall,with medium-longth hole blast,ideal effect was ob- tained in the recovery,reference value was also provided for moderately stable pil.
使用中深孔爆破法进行回收,取得了理想效果,也为顶板中等稳固的同类矿山提供了参考价值。