判断题

物相分析的手段主要有X射线衍射、电子衍射、中子衍射及声音衍射。
正确错误

答案：错误

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单项选择题

计算留存盈利比例指标时，留存盈利不是指每年累计下来的盈利，而是指当年利润中留下的部分。
A、正确
B、错误

The ____________ theory believes that learning is a process in which the learner constructs meaning based on his/her own experiences and what he/she already knows.

答案： constructivist或Constructivist