Using hydraulic supports in heavy grade longwall face with sublevel caving, anti-topple and antiskid are the key factors.
在大倾角倾斜煤层进行综放开采，支架的防倒、防滑成为决定放顶煤开采成功与否的关键。
You start with heavy-grade sandpaper. Then, you move to finer-grade sandpaper.
先用粗颗粒的砂纸磨，然后再用细颗粒的砂纸。
You start with heavy-grade sandpaper. Then, you move to finer-grade sandpaper.
先用粗颗粒的砂纸磨，然后再用细颗粒的砂纸。
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