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巷道支护
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巷道支护
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巷道支护
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drift support and reinforcement
巷道支护
为保持巷道与硐室围岩稳定,对巷道和硐室进行的支护作业活动。
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quaternary human
Quaternary mammalian faunas of China
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Quaternary paleoecology
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Quaternary Sciences
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