bobbin support bolt 纬管托板螺丝

engine front support bolt 发动机前支座螺栓

compressor support bolt 压缩机支承螺栓

gear reducer support bolt 齿轮减速器支座螺栓

Rear support insulator bolt 后支架软垫螺栓

anchor bolt support 锚杆支护

bolt-shotcrete support 锚喷支护

shotcrete and rock bolt support 喷锚支护

Bolt Support Design Method 锚杆支护设计方法