Description is made on the principle and application result of the short group bolting of slushing roadways in loosened rock.
论锚杆群支护碎裂岩中耙道的原理及实。
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55.a new stop valve to be installed before the waste oil filter of waste oil incinerator for convenient slushing , the drain screw to be changed with cook
在废油焚烧炉的废油过新的截止阀以便冲洗,排放螺栓应换成旋塞。
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