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透镜焦距
tech. focal length of lens
透镜焦距〈激光焊接〉
plast. lens focus
透镜焦距: 32 phrases in 11 subjects
Agriculture1
Air defense1
Aviation2
Business1
Cultural studies1
Electronics2
General4
Metallurgy4
Optics branch of physics1
Shipbuilding1
Technology14

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