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封密环
tech. seal ring
封密环
: 227 phrases in 21 subjects
Architecture1
Automobiles24
Aviation1
Chemistry10
Compressors23
Construction1
Drilling4
Electric machinery11
Electronics21
General6
Hydroelectric power stations5
Mechanics1
Metallurgy12
Nuclear and fusion power2
Oil / petroleum9
Plastics2
Shipbuilding1
Space6
Submarines1
Technology85
Wind Energy1

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