发布时间:2025-02-01 06:59:17
看巷道了,如果是全岩巷道,大概是两万一米,煤巷大概在6000一米。
不锈钢316l材质比316贵多少比304贵多少是简单的固定设备 螺栓这块3种产品能差多少
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