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down-flow fixed bed
down-flow spout
down-hand welding
down-hill method
down-hole drill
down-hole flowmeter
down-hole pump
down-home
down-lead
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down-hole drill
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down-hole drill
Definitions
[1]
[矿业]
潜孔钻机
[2]
[矿业]
入孔冲击钻机
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down-hole drill