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GBC石墨管-Tube,coated,halfrings
GBC石墨管-Tube,pyrocoated,Omegaplatform
GBC石墨管-Tube,uncoated,rings
GBC石墨管-Tube,pyrocoated,rings
GBC石墨管-Tube,forUltra-Z
GBC石墨管-Tube,forUltra-Z,holesandrings