根尖片投照的分角技术是指

A．X线与被检查牙齿的长轴垂直

B．X线与胶片垂直

C．X线与被检查牙齿的长轴及胶片之间的分角线垂直

D．X线与被检查牙齿的长轴和胶片之间的分角线平行

E．X线与咬合平面平行

—When will you return the book to me?

—I’ll give it to you _________ I finish it.

A．once

B．until

C．as soon as

D．unless