A.1mm B.2mm C.3mm D.4mm E.5mm
A.2mm B.5mm C.8mm D.10mm E.15mm
A.與黏膜密合 B.離開(kāi)0.5~1mm C.離開(kāi)1.5~2mm D.離開(kāi)2.5~3mm E.離開(kāi)3.5~4mm