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shaft drilling
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shaft drilling
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竖井施工方案
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shaft drilling
竖井凿岩
竖井施工中,在井筒围岩上钻凿炮孔的作业。是竖井掘进中的一项主要工序,约占整个掘进循环时间的20%~30%。
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color fraction 3D display technology
Colorful
colorful flower field in Hokkaido, Japan
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Colorful Murals of Duhuang
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color gamut standard of HDTV
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color glass condensate
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color graph
colorgraph
color graphics adapter
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