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double two high rolling mill
doublet Ⅲ
double U groove
double unilineal
double unilineal descent
double union
double unit
double universal joint
double-up method
double up post
double uranium fluoride
double-used grassland
double vacuum process
double V-belt
double V butt joint
double vector divergence
double vein
double voltage system
double-wall board
double wall tube
double warp tricot
double water glass
double wave
double weave
double wedge aerofoil profile
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