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Electronics
containing
岩 心
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all forms
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in specified order only
Chinese
English
双层
岩心
管
double tube core barrel
回转式
岩心
管钻
calyx shot drill
回转式
岩心
管钻
calyx core drill
无
岩心
钻进
non-core drilling
空心岩石锚杆
hollow core rock bolt
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