阅读下面的短文，根据短文内容回答问题。
It's a rainy Saturday. Mary and her family are spending the afternoon at home. Her uncle and aunt are visiting them.
Mary's father, Mr Harris, and her uncle and aunt are in the living room. Her father is drawing a picture and her uncle and aunt are watching the news on TV. They are also talking.
Mary's elder brother, Peter, is in his bedroom playing computer games. He is a computer fan and he spends much time playing on the computer. His younger brother, Jim, is also in the living room. He is playing with his model cars.
Mary's mother, Mrs Harris, is in the kitchen preparing food for all of them. She is making some hamburgers and orange juice.
Mary is talking to her friends, Lucy and Tom. They are from another town and want to draw pictures and play with Mary.
Fluffy, the family cat, is sleeping on the kitchen's sofa. He is a lazy cat. Fluffy eats a lot, and he is a really fat cat.
回答下面5个问题，每题答案不超过8个词。
2PbSO4+2H2O，下列关于铅蓄电池的说法正确的是（ ）