常見例句

• This coal mine are rare byerlyte with good quality.As shown by complicated study of coal quality,in order to use resource resonably and gain maximum b...
  煤質的綜合研究表明,為達到珍惜和合理利用資源,并使其效益最大化,該煤層應以冶金和鑄造用焦為主要加工利用方向。
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