市民应当(),以应付突发性的灾害事故。()
A、学习应急基本知识
B、接受应急基本技能的培训
C、参加社区应急演练
D、支持应急工作
参考答案:A, B, C, D
A.A→F△H=-△H6
B.A→D△H=△H1+△H2+△H3
C.△H1+△H2+△H3+△H4+△H5+△H6=0
D.△H1+△H6=△H2+△H3+△H4+△H5
用正确的介词填空。
1. We went home _____________ February 1st.
2. I bought presents _____________ my friends.
3. She got back _____________ Beijing last week.
4. _____________ the last day of the holiday, I went to the bookstore _____________ my parents.
5. _____________ the first day, I climbed a mountain.