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槽方式及布孔参数影响着掘进效率和成本。
The cut way and hole parameters affect the drivage efficiency and cost.
youdao
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布放后应保留适当长度于引进端人（手）孔或拉箱内。
Keep proper length of pipe when put into the manhole .
youdao
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布放后应保留适当长度于引进端人（手）孔或拉箱内。
Keep proper length of pipe when put into the manhole .
youdao