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드릴 바
설정 된 수평 대신 수직으로 지 하 직장 훈련 열.
- ส่วนหนึ่งของคำพูด: noun
- อุตสาหกรรม/ขอบเขต: Mining
- Category: General mining; Mineral mining
- Government Agency: USBM
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ผู้สร้าง
- Hyun-woo Kim
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(V.I.P) 28279 points - 100% positive feedback
(Seoul, South Korea)
