常見例句

• Letterpress emphases expatiate what make of calcium carbide production solid costoff produce oil well cement craftwork precept and notice question.
  重點(diǎn)闡述了如何利用電石及其深加工產(chǎn)品固體廢棄物生產(chǎn)油井水泥的工藝方案及注意問(wèn)題。
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