It is demanded urgently to establish a universal design criterion, speed up the development of dedicated equipment and seek more ways to refrigeration in the mine.

目前应抓紧制订统一合理的井下空调气候标准，加强配套设备的研制开发，探讨矿井空调制冷方式的多样化。

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Due to the complexity of mine design, the development of modern design of mine lags behind relatively.

由于矿山设计的复杂性，矿山现代设计的步伐也相对落后。

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An intrinsically safe signal telephone system special for mine use is dealt with in this paper including its development, construction, design features and application results.

介绍了一种专为煤矿井下使用的本安型信号电话系统的研究和它的构成、设计特点及使用效果。

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