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问题 选择题

下列有关铁及其化合物的转化关系中，不能实现的是（　　）

A．Fe→Fe3O4

B．Fe2O3→FeCl3

C．Fe→FeSO4

D．Fe（NO3）3→FeCl3

答案

答案：D

改错题

单句改错。(每句中均有一处错误)

1. Please make a list of thing you are not good at. _____

2. What are the three basic questions about learn English? _____

3. I understand my English teacher, but it's sometime hard to understand American and British accents. _____

4. You should speak English all the times in class. _____

5. Mr. Zhang enjoys to watch TV very much. _____
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单项选择题

在现场对环形防喷器进行试压或动作检查时（）封零试验。只做封环空试验。

A、必须做

B、可以做

C、不做
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