炎热的夏天，从冰箱中取出的啤酒瓶放置一会儿后，发现瓶外壁“冒汗”．请你用所学的物理知识解释这种现象．

若反比例函数y=（m+1）$x^{2-m^2}$的图象在第二、四象限，m的值为____ 

    I'm Peter. There are four people in my family. They are my father, my mother, my grandfather and me. I'm twelve. My birthday is on 15th March. My parents are both doctors. They help people. Their birthdays are both in May. My grandfather is old. He is sixty-five. His birthday is on 9th June. He likes reading. I like reading too. I want to be a teacher in the future. I want to teach Chinese in a school.

图示某弧岛上存在捕食关系的两种生物种群个体数量变化，据图分析正确的是(　　)

9的平方根是（   ）