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。
Backing paper: a base layer to give strength or support to a top layer.
托底纸：用来支撑面层的纸以啬强度或承托面层。
It can direct layer of protection design and provide data to support its design.
为防护层设计提供必要的依据和指导，可以更好的降低系统风险并提高安全性。
The magma under coal layer bottom does support action.
而煤系地层底部的岩浆侵入体，起了砥柱作用。
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 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 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。
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