下列物质含有非极性共价键的共价化合物是
A.H2O2
B.HCl
C.Na2O2
D.Cl2
答案:A
根据句意、英文释义、首字母或中文提示完成下列句子。
1. W comes after autumn.
2. On New Year’s Day we can get red packets from our parents , and there is always some in them.
3. He is short, playing basketball is (difficult) for him.
4. Peter and I are (都) from England.
5. All the students are here e Tom, he is ill at home.
不符合公共浴池卫生要求的是()
A.浴池水每日更换
B.浴室内设公用脸巾、浴巾
C.浴池内CO2浓度不应大于0.15%
D.一天中要补充新水2次
E.每次补充新水的量不少于池水总量的20%