负压系统 negative pressure systems; negative-pressure system 高压系统 high pressure system; high tension system; high-pressure system; high-voltage .
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The application effectiveness of both high and low negative pressure systems in Laowuji Mine is described.
介绍了高低负压瓦斯抽放系统在老屋基矿的应用效果。
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模块上移
模块下移
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