在一定条件下，可发生反应：RO3n- +F2+2OH-==RO4-+2F-+H2

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问题选择题

在一定条件下，可发生反应：RO₃^n- +F₂ +2OH^-==RO₄^-+2F^-+H₂O。则RO₃^n-中R元素的化合价是 [ ]

A.+4

B.+5

C.+6

D.+7

答案

答案：B

填空题

A: Have you seen Li Ling these days?

B: No, she’s gone to Jilin 1. __________ her grandfather.

A: Has she ever been there before?

B: Yes, she lived there before she came here.

A: Have you 2. __________ her?

B: Yes, I’ve just received a letter from her.

A: 3. __________?

B: She said she had a very good time and would 4. __________ there for another week.

A: What else did she say?

B: She also wanted me to give her best 5. __________ to you.

A: It was very nice of her to say so.

问答题简答题

简述解放区在1945到1946开展减租减息运动的意义？