In the constitution of energy consumption in our country, coal is the main energy, air pollution is a serious environment problem caused by coal mining and use.
我国的能源消费构成中，主要是以燃煤为主，在煤炭开发和使用中所带来的环境问题，以大气污染最为严重。
2
The paper introduces the working principle, constitution and application of a new type liquid variable resistance starter of high power motor used in coal mine.
介绍了一种新型矿山大功率电机液体变阻启动器的工作原理、构成及应用情况。
3
This special kind of constitution relationship provides beneficial condition for the forming of oil derived from coal.