A:N2的电子式:
B:Na2O2的电子式:
C:CO2的电子式:
D:NH4Cl的电子式:
计算 =____, =____, =____.
①是公民基本的民主权利
②中华人民共和国公民年满18周岁
③有利于公民在基层自治中选出自己的当家人
④是公民的根本行为准则
Tomorrow we will go to Hainan. It's warm there. We will have a special Chinese New Year's Day. Now let's get ready! We need three tickets from Shijiazhuang to Hainan. We don't need winter clothes. I want a beautiful dress. My parents take some T-shirts and shorts. We need to take milk, cakes and fruit. We need three hats. The sun is very hot there. We don't want to turn black. That's all done.
① ② ③ ④
⑤ ⑥ ⑦ ⑧
⑨ ⑩ ⑪ ⑫
____