A.光滑、平整B.允許有輕微氣泡C.無(wú)明顯的痕紋、凹陷D.色澤不均及分解色線(xiàn)E.不允許有裂口
A.50 B.75 C.90 D.110 E.125
A.50 B.63 C.75 D.110 E.φ40