单位按上年年度职工月平均工资的3%缴纳失业保险基金。
参考答案：错
在1200℃时，天然气脱硫工艺中会发生下列反应
①H2S（g）+ O2(g)=SO2(g)+H2O(g) △H1
②2H2S(g)+SO2(g)=S2 (g)+2H2O(g) △H2
③H2S(g)+O2(g)=S(g)+H2O(g) △H3
④ 2S(g) =S2(g) △H4
则△H4的正确表达式为
A．△H4=（△H1+△H2-3△H3）
B．△H4=（3△H3-△H1-△H2）
C．△H4=（△H1+△H2-3△H3）
D．△H4=（△H1-△H2-3△H3）
根据所给单词写出正确形式
1. Where can we buy these ________(watch)?
2. He often ________(listen) to BBC in the morning.
3. Andy ________(not do) her homework sometimes.
4. I want to _________(buy)s new T-shirt.
5. Everyone _________(be) in the classroom.
6. How does she _________(do)it?
7. There is a _________(swim)pool in our school.
8. Would you like to go with ________(I) after school?
9. His father looks at his son ________(happy).
10. Don’t forget to come to ________(Millie) party.
