A.220mm B.230mm C.240mm D.250mm
A.予割口5mm,連續(xù)屈撓3萬(wàn)次 B.予割口5mm,連續(xù)屈撓4萬(wàn)次 C.不割口,連續(xù)屈撓3萬(wàn)次 D.不割口,連續(xù)屈撓4萬(wàn)次
A.250mm B.255mm C.260mm D.265mm