middling coal

常見例句

雙語例句

• The most reactive coal is in the middling coal-bank;
  含灰量低的中等變質(zhì)程度的煤氧化活性最高；
• The coals used included high-sulfur raw-coal, low-sulfur raw-coal and middling coal.
  所用煤種包括高硫原煤、低硫原煤、中煤。
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