... 平均射程 mean range 地面钻井开采 mining with surface drill well 有理形式 rational form ...
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地面钻井开采
Surface drilling
以上为机器翻译结果,长、整句建议使用 人工翻译 。
开发煤层气的方法有地面钻井开采和井巷开采两种,其中井巷开采方法适用于我国许多矿区。
Its extracting method includes surface well drilling and underground mine tunnelling. The tunnelling method is suitable for many mine areas in our country.
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