Presents the method of supporting soft-rock drifts by releasing pressure with a guided roadway. 介紹了導巷卸壓支護軟巖巷道的方法。
We strongly recommend installing a safety relief valve in addition to the unloader to add more protection from dead-heading. 我們強烈建議，除了減壓器外，再安裝安全卸壓閥來(lái)防止跑空。
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