They wouldn’t let us through without examining our passports very carefully,_______?

A．will you　

B．shall we

C．would they　

D．don’t we

与图像显示上下位置偏移有关的操作是（）

A.病人摆位左右偏移

B.扫描机架倾角过大

C.床台升降调节有误

D.床台进出调节有误

E.扫描野选择有误