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internal thread
mech. 内螺纹
plast. 阴螺纹; 内螺纹〈美〉
tech. 内螺丝 (齿纹)
internal screw thread
el.mach. 内螺纹
internal thread
: 27 phrases in 8 subjects
Automobiles2
Aviation1
Chemistry1
Drilling4
Earth sciences1
Metallurgy1
Oil / petroleum5
Technology12

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