A:在该食物网中,共有5条食物链存在
B:在该食物网中,H处于三个不同的营养级
C:若B种群中各年龄期的个体数目比例适中,则该种群的密度在一段时间内会明显变大
D:在该食物网中,如果C种群的数量下降10%,则H的数量不会发生明显变化
如图所示的四种物理现象属于汽化的是( )
I'm Jim. Today is my birthday. I want to thank my family for their love. So I cook dinner for them. I know my mother likes hamburgers and salad. But my father likes chicken and tomato soup(汤). I have a brother. He likes hamburgers, too. But he doesn't like salad. He likes carrots. I have a sister, too. She likes fish(鱼肉) and bread. I like chicken and strawberries. I will buy these things for the birthday party.
小明同学学过核能发现:现在建的核电站是利用核能来发电;而原子弹也是利用核能放出的大量的能量达到摧毁的目的.它们工作的过程相同吗?它们有什么异同点?