下圖所示游標卡尺,其讀書為:()
A.33.34mm B.21.34mm C.13.34mm
A.6.15~Ø6.25 B.7.15~Ø7.25 C.6.95~Ø7.25
A.Re=Ac+1 B.Re=Ac+2 C.Ac=Re+1