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取心钻头 qǔxīn zuàntóu
dril. coring bit; annular bit; core drilling bit; core head; hollow bit
oil core bit
取岩心钻头
met. rock core bit
取 心钻头
: 51 phrases in 6 subjects
Drilling17
Earth sciences1
General1
Mechanics4
Oil / petroleum19
Technology9

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