题目内容

教师有()感和责任感是决等反思能否进行和是否有效进行的前提条件。

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简述国民经济效益评估与财务效益评估的关系。

缓冲液的作用()

Hi, Celia!()to the United States? It was wonderful. I really enjoyed it.

A. What was your idea
B. How was your trip
C. Who went
D. How often did you travel

定滑轮不改变提升重物时力的方向,同时还省力。

A. 正确
B. 错误

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