It's an old photo of my father.I________it when I was looking for my passport the other day.[ ]

A．came into  

B．came about

C．came across

D．came on

焊缝坡口尺寸样板是一种外样板，用以判断坡口______等尺寸的正负偏差值。

A．加工精度

B．角度

C．圆弧大小

D．深度