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问题 不定项选择题

高铁酸钾（K2FeO4）是一种新型、高效、多功能水处理剂，比Cl2、O3、ClO2氧化性更强，且没有二次污染。高铁酸钾能与水发生反应。以下有关高铁酸钾的说法正确的是[ ]

A．高铁酸钾属于氧化物

B．高铁酸钾应密封、防水保存

C．高铁酸钾中铁显+3价

D．高铁酸钾中钾元素和氧元素的质量比是1︰2

答案

答案：B

单项选择题

Which of the following is true according to the passage a. The 1997 storm killed more than 250 people. b. The economic losses caused by the 1997 storm were 90.8 billionyuan. c. More than 1,800 people were wounded when the typhoon hit Zhejiang Province. d. The government evacuated 40,000 people to avoid more casualties.
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多项选择题

弗洛伊德的早期理论包括（）

A、潜意识理论

B、梦的解释

C、泛性论

D、本能学说

E、人格理论
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