Anchor/supportbolt holes are located in base of body.
固定器/支架螺栓孔位于阀门的基座。
2
Forward supportbolt combined with roop rock by bolting can play a roll of combined beam, which can prevent roof rock caving immediately after explosion.
超前支护锚杆锚固后与顶板岩石构成一体，这样使超前锚杆形成组合梁作用，放炮后，能够阻止顶板岩石冒落。
3
Though other browsers do support extensions, widgets, etc., Firefox has by far the largest selection of bolt-on features of any Web browser.