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由于该煤层厚度适中，选用掩护式液压支架。
Because this coal bed thickness is moderate, selects the shield type hydraulic pressure support.
youdao
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英国煤层的平均厚度为1米。
The average UK coal seam is one metre thick.
youdao
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英国煤层的平均厚度为1米。
The average UK coal seam is one metre thick.
youdao