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for subject
Metallurgy
containing
开 通
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Chinese
English
区间
开通
unblocking
四通开关
four way cock
开口方形直通
不翻转
孔型系统
open-square strand passes
开口方形直通孔型系统
open square strand passes
开式通风系统
open ventilation system
开通
unjamming
连通开关
coupling cock
通断开关
on-and-off switch
通风开关
draught switch
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