英语词典
The paper introduces some methods of constructing bunker by the sinking stage lifted with manual calabash. After using the counter-well drilling machine drill hole to brush in a big way, carrying on permanently support again;
长段掘进煤仓,喷射混凝土临时支护,用手动葫芦升降永久支护混凝土砌壁工作盘进行煤仑施工。采用反井钻机钻孔后刷大,再进行永久支护;
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