The roof abscission layer is the biggest security risk in bolting support tunnel.
顶板离层是锚杆支护巷道最大的安全隐患之一。
The roof separation layer is the biggest security hidden danger in bolt support tunnel.
顶板离层是锚杆支护巷道最大的安全隐患之一。
The roof abscission layer is the biggest security hidden danger in bolting support tunnel.
顶板离层是锚杆支护巷道最大的安全隐患之一。
Underground tunnel support of soft expansion rock is a main difficulty in mine construction currently.
松软臌胀岩层的井下巷道支护是目前矿山建设中的一个主要难点。
Underground tunnel support of soft expansion rock is a main difficulty in mine construction currently.
松软臌胀岩层的井下巷道支护是目前矿山建设中的一个主要难点。
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