A:铁粉放入稀硫酸溶液:2Fe+6H+═2Fe3++3H2↑
B:往NH4HCO3溶液中加过量的NaOH溶液并加热:NH4++OH﹣ △_ NH3↑+H2O
C:石灰石与稀盐酸反应:CO32﹣+2H+═CO2↑+H2O
D:Cl2通入水中:Cl2+H2O⇌H++Cl﹣+HClO
用电量(度)
120
140
160
180
200
户数
2
3
6
7
则这20户家庭该月用电量的众数和中位数分别是( )
Name
Height(cm)
Weight(kg)
Place to live
Places around home
Hobbies
Things to do at the weekend
Ann
150
38
city
shops, a cinema, a library
reading
read books, see a film
Sue
145
40
countryside
hills, rivers,
trees
riding,
running
run with her dad
独立寒秋,湘江北去,橘子洲头。
看万山红遍,层林尽染;漫江碧透,百舸争流。
鹰击长空,鱼翔浅底,万类霜天竞自由。
怅寥廓,问苍茫大地,谁主沉浮?