如图所示，将一块重为3N，体积为100cm³的石块，用细线系着浸没在装有水的圆柱形容器中，容器中水的深度由10cm上升到12cm．（容器的重力和容器壁的厚度忽略不计，g=10N/kg）．求：

（1）石块所受浮力；

（2）容器中水的重力；

（3）细线松动，石块沉到容器底静止后，容器对水平地面的压强．

设a，b，c为三角形ABC三边，a≠1，b＜c，若log_c+ba+log_c﹣ba=2log_c+balog _c﹣ba，则三角形ABC的形状为（　　）

Food is very important to our health. Everyone needs to eat well if he or she wants to have a strong body.
Our minds, like our bodies, always need the best food. This kind of food is knowledge. We start getting knowledge when we are very young.

康有为维新思想最突出的特色是（   ）