阅读小天地。

      There are four people in my family. They are my father, my mother, my sister and I. My father is a teacher.

He is 40 years old. My mother is a doctor. She works in a hospital. She likes her work very much. My sister is

a student. She is a good student. I am a student too. I like my school.

根据短文内容，判断下列句子的正(√)误(×)。

( ) 1. My mother is a teacher.

( ) 2. My mother is 40 years old.

( ) 3. My father is a teacher.

( ) 4. I am a student.

( ) 5. I like my school.

下列有关恒压充电的特点错误的是（）。

A.产生很少气体

B.耗水量少

C.充电不完全

D.充电耗时短