The ______ look on her face indicates that the film on show must be ______; otherwise, she would not look so pale.[ ]

A. terrified; frightened

B. terrifying; frightened  

C. terrified; frightening

D. terrifying; frightening

JB 3963-85标准中进行等级分类的依据是（）

A、单个缺陷反射波幅

B、缺陷引起的底波降低量

C、缺陷密集区占探伤总面积百分比

D、以上都可以作为独立评级的依据