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to phrases
kelly cock
dril.
方钻杆防喷安全阀
oil
方钻杆阀
;
方钻杆旋塞
tech.
方钻杆上部阀
kelly cocks
dril.
方钻杆旋塞
kelly cock
:
9 phrases
in 3 subjects
Drilling
4
Metallurgy
1
Oil / petroleum
4
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