沉头带榫螺栓 screw flat countersunk nib bolt: 螺旋平头垫头螺栓flat countersunk nib bolts: 沉头带插销马车螺栓; 沉头带榫螺栓flat countersunk double nib bolts: 沉头双榫螺栓countersunk bolt: 沉头螺栓; 埋头螺栓; 埋头螺丝mushroom-head nib bolt: 扁圆头带棒螺栓下载手机词典可随时随地查词查翻译