物质的性质决定用途.下列是物质的一些性质:①密度小,很稳定、②有吸附性、③有导电性、④易升华、⑤能与酸反应.请选择恰当的数字序号填空.
用途
石墨作电极芯
活性炭用于防毒面具
氦气用于探空气球
碳酸氢钠用于面点发酵
干冰用于人工降雨
性质
(1)石墨____
(2)活性炭 ____
(3)氦气 ____
(4)碳酸氢钠 ____
(5)干冰 ____
⑴made____ Look at that robot.
⑵strong____ My brother is hardworking.
⑶finish____ We can do our homework after dinner.
⑷girl____ My father helps him to clean his room.
⑸beautiful____ Li Hua is really clever.
I'm Lucy. I have a happy family. There are four people in my family. My birthday is on January 1st. It's New Year's Day, too. My family and I will have a big dinner on that day. I have a little brother. He is four years old. His birthday is in winter. It's very cold but we can make a snowman. My mother's birthday is in March. My father's birthday is in March,too. We can plant trees and fly kites.