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double spectroheliograph
双筒太阳单色光照相仪
double spectroheliograph
double spectroprojector
double speed
double speed gear
double speed pulley
double spindle automa...
double spine saw
double spiral
double spiral gear
double spiral staircase
double spiral turbine
double splayed coping
double spline
double split brush
double split flow
double splitter
double spread
double spreading
double spring
double spring bottom ...
double spur grade
double square
double squirrel-cage ...
double squirrel-cage ...
double squirrel-cage ...
double squirrelcage m...
double stage ammonia ...
double stage compressor
double stage digester
double stage nitriding
double stain
double staining
double stand rolling ...
double standard
double standard country
double standard hamme...
double standard seam
double star
double star connection
double star equal alt...
double star point
double star rectifier...
double star winding
double star-guad cable
double start thread
double state
double steal
double steering
double stepped labyri...
double stewpot (双...
double stick hank dyeing
double stochastic matrix
double stop
double strand
double strand chain
double stranded
double stranded helix
double strap
double strap seam
double strapped joint
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