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环形空间 huánxíng kōngjiān
dril. annulus
oil annular space
安全壳环形空间 huánxíng kōngjiān
el. annulus area
环形空间
: 21 phrases in 6 subjects
Drilling2
Earth sciences3
Electronics5
Explosives and Explosive Ordnance Disposal1
Oil / petroleum8
Technology2

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