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hollow drill steel
eng.geol. 空心钻杆
met. 中空钎钢
steel. 中空钢
tech. 中空钻探钢; 六角钢; 炮钎钢
hollow-drill steel
met. 钎子钢; 中空钢
hollow drill steel
: 7 phrases in 2 subjects
Metallurgy4
Technology3

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