screw flat countersunk nib bolt的意思|示意
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螺旋平头垫头螺栓
screw flat countersunk nib bolt的网络常见释义
螺旋平头垫头螺栓 ... half round countersunk head bolt 半圆沉头螺栓 screw flat countersunk nib bolt 螺旋平头垫头螺栓 hexagon socket countersunk head bolt 六角承窝平顶埋头螺栓 ...