The sulfide (especially troilite) contained in coal seams is representative a kind of strong reducing environment.
煤层中含有硫化物（特别是硫铁矿），代表一种强的还原环境。
Where a document is not signed by a legal representative, a power of attorney from such legal representative shall be provided.
非法定代表人签署文件的，应出具法定代表人的委托授权书。
Where a document is not signed by a legal representative, a power of attorney from such legal representative shall be provided.
非法定代表人签署文件的，应出具法定代表人的委托授权书。
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