如图所示，一轻质杠杆AC可绕支点O自由转动，在B点挂一重为G的物体．为使杠杆在水平位置保持平衡，画出施加在杠杆上最小力F的示意图．

把我国建设成为富强民主文明和谐的社会主义现代化国家是（  ）

阅读短文， 判断句子对“正确”错“错误”。

I'm a girl from Guangzhou. I have a pen pal. His name is John. He's an Australian boy. He's twelve years old. He studies in Guangzhou now. John is a good student. He studies hard every day. John often cooks breakfast, lunch and dinner by himself. He likes Chinese food very much. He is interested in cooking. And he's good at cooking.

如图，在平面直角坐标系中，Rt△OAB的顶点A在x轴的正半轴上，顶点B的坐标为 $\left(\sqrt{2}，\sqrt{2}\right)$ ，点C的坐标为（1，0），点P为斜边OB上的一动点，则PA+PC的最小值为（   ）