—This camera is very similar ________ that one.

—Yes. I have some trouble ________ their differences.

A．as; telling

B．to; telling

C．to; to tell

D．with; to tell

在等厚干涉实验中，劈尖呈现的条纹间距应该（）

A.有序递减

B.有序递增

C.几乎相等

D.以上均不对