He was __ with the results of the exam, which can be seen from his __ smile.

A．satisfied, satisfying

B．satisfied, satisfied

C．satisfying, satisfied

D．satisfying, satisfying

有一底面积为1分米²的圆柱形容器，内盛2分米深的水。现将一块重3.4牛顿，体积为0.5分米³的正方形物体投入水中（设水未溅出）求：

（1）物体静止后受到浮力的大小和方向？

（2）容器底受到总压力多大？