And then, the rational form of section and permanent support of primary tunnel in high-temperature mine is put forward.

进而提出热害矿井主要巷道的合理断面形式和永久支护形式。

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And then, the rational form of section and permanent support of primary tunnel in high-temperature mine is put forward.

进而提出热害矿井主要巷道的合理断面形式和永久支护形式。

youdao