For rock roadway layout layer, the necessity and feasibility of using nude alley, a hell of arch, the U-steel shed, bolt net and spraying and other forms of support are expounded.

针对岩巷布置层位，阐述了采用裸巷、砌碹、u型钢棚、锚网喷等多种支护形式并存的必要性与可行性。

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If there is a Usain Bolt moment in the U.S., it will be on a baseball diamond In New York on Tuesday.

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