bright coal

• 1. 光亮煤: bright coal | glance coal | lustrous coal
• 2. 光亮型煤: bright coal | vitrain | glossy coal

• 1.煤粉光亮碳可作为煤粉的技术性能指标。
  Lustrous carbon is deemed as technical data for evaluation of coal-dust.
  dict.yoduao.com
• 2.光亮碳高的煤粉用于型砂，可降低铸件表面粗糙度值。
  The use of coal-dust with high lustrous carbon in molding sand can improve surface roughness of the castings.
  dict.yoduao.com

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