A.僅是用錐形連接B.僅是用螺紋連接C.錐形連接和螺紋連接D.圓形連接
A.1.2-1.4B.1.4-1.8C.1.2-1.8D.1.4-1.6
A.30°~60°B.60°~90°C.90°~120°D.120°~150°