Bolt support has been the main support form of the mine roadway in the under - ground engineering because of its obvious technical and economical superiority.
由于锚杆支护显著的技术经济优越性，已成为矿井巷道等地下工程支护的主要形式。
Bolt support has been the main support form of the mine roadway in the under - ground engineering because of its obvious technical and economical superiority.
由于锚杆支护显著的技术经济优越性，已成为矿井巷道等地下工程支护的主要形式。
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