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空心钻杆
archit.
hollow drill shank
eng.geol.
hollow drill steel
;
hollow stem
tech.
hollow boring rod
;
hollow drill shank steel
;
hollow rod
空心
钻井
钻杆
tech.
hollow drill rod
空心钻 杆
:
6 phrases
in 2 subjects
Engineering geology
2
Technology
4
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