动物分两大类,脊椎动物和无脊椎动物,下列是脊椎动物的是( )
A:蜻蜒
B:蜜蜂
C:蛇
D:蚯蚓
Hello. My name is Lin Tao. I am a boy. I am a student. There are three people in my family. My father is a tall man. His name is Lin Liang. He is a doctor. My mother is a short woman. Her name is Wang Hong. She is a teacher. I love my father and my mother. My father and my mother love me, too. We are a happy family.
下列化学方程式与对应反应类型均正确的是( )
化学方程式
反应类型
A
H2OH2+O2
分解反应
B
CaO+H2O═Ca(OH)2
化合反应
C
2Fe+6HCl═2FeCl3+3H2↑
置换反应
D
SO3+2NaOH═Na2SO4+H2O
复分解反应