---Where did the accident happen?

---It was at the post office near the Mansion Friendship ______ the peace talk would be held.

A．where

B．which

C．that

D．When

一艘轮船的船底被撞了一个洞，若洞口距水面的深度是9.8米，则洞口处水的压强多大？若用来堵洞的堵塞物受到水的压力为96牛，则洞口的面积约是多少厘米²？