The draft of coal mine excavation plan is typically an unhealthy structural and complex tech economic problem.

矿井采掘计划的编制是典型的不良结构和复杂的技术经济问题。

youdao

However, the resource-bearing regions distribute uneven. The conditions of complex coal mining technology and biological environments limit the coal resource development of energy bases.

但是，我国煤炭资源地域分布不均衡，复杂的煤矿开采技术条件和生态环境制约着我国能源基地煤炭资源的开发。

youdao

This observation, as the first evidence, experimentally supports the theory of possible occurrence of iron-polysulfur complex in coal suggested recently.

由此，首次以确切的实验证据支持了过去关于煤中可能存在铁硫复合结构的理论推测；

youdao

This is very complex and untested technology compared, say, to coal- and gas-fired or nuclear power plants.

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