________ thousands of people outside; it was too noisy.[ ]

A. There seemed to be

B. There seemed to have

C. It seemed to be

D. It seemed to have

在管与板的胀接结合中，由于管与板之间的（）使胀口达到密封。

A、弹性变形

B、塑性变形

C、弹-塑性变形

D、径向弹性压力