頭型 screw head. A, B, C, D, E. 1, 螺絲頭型. SCREW HEAD. 2. 3, 平頭. Flat, 崗山頭. Binding, 圓頭. Round, 大扁頭. Truss, 缽頭. Brazier. 4. 5, 盤頭(雙R)
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