Look at the bulletin board of Class 3.
Kitty needs a new home
Kitty: 3-month-old cat. White.
Cute and beautiful.
See Elsa.
Mr. Jones from Yangming
The police officer is going to give us a special talk on traffic safety
3:00 pm ~5:00 pm, Jan.17
In the gym
Whose wallet? Found at the front door of the classroom on Jan.5
See Ms Chang
I'm selling A NEW NOTEBOOK
For music classes.
Just two dollars
Jack
Did you have a good time at the party? Yes, indeed. It's years _____ I enjoyed myself so much.
己知：2MnO4﹣+5H2O2+6H+═2Mn2++8H2O+5O2
操作①：取10.00mLH2O2溶液（密度为1.00g•mL﹣1）置于锥形瓶中加水稀释，再加稀硫酸酸化；
操作②：用0.200 0mol•L﹣1KMnO4溶液滴定；
操作③：用同样方法滴定，4次消耗KMnO4溶液的体积分别为20.00mL、19.98mL、20.02mL、22.00mL．请回答下列问题：
如图，在平行四边形ABCD中，如果，那么等于（ ）
，那么
等于（ ）