A.輕輕接觸B.緊密接觸C.離開(kāi)O.5mmD.離開(kāi)1.5mmE.不能無(wú)壓力
A.1.2mm B.1.Omm C.O.9mm D.O.8mm E.0.7mm
A.10° B.20° C.30° D.40° E.45°