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JUS B Z0 112-1978 Cross-sections of mine openings Sbpe of mining vjorking rectangular section with one raibvay or without railway《矿山巷道的横截面 带一条轨道或无轨道采掘作业矩形截面的斜坡》.pdf

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JUS B Z0 112-1978 Cross-sections of mine openings Sbpe of mining vjorking rectangular section with one raibvay or without railway《矿山巷道的横截面 带一条轨道或无轨道采掘作业矩形截面的斜坡》.pdf_第1页
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JUS B Z0 112-1978 Cross-sections of mine openings Sbpe of mining vjorking rectangular section with one raibvay or without railway《矿山巷道的横截面 带一条轨道或无轨道采掘作业矩形截面的斜坡》.pdf_第2页
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