A.0.5mm B.1mm C.1.5mm D.2mm E.緊密接觸,無(wú)間隙
A.2mm B.3mm C.4mm D.5mm E.6mm
A.3~8mm B.3~6mm C.3~5mm D.3~4mm E.齊齦或齦上3mm以內(nèi)