A.1.5mm B.2mm C.2.5mm D.3mm
A.220mm B.230mm C.240mm D.250mm
A.予割口5mm,連續(xù)屈撓3萬次 B.予割口5mm,連續(xù)屈撓4萬次 C.不割口,連續(xù)屈撓3萬次 D.不割口,連續(xù)屈撓4萬次