The article talks about how to design questions at the beginning and ending of teaching. on the important and difficult points of teaching material, to stimulate the pupils' thoughts.
文章论述了如何在授课起始时设疑提问、在教材重、难点处设疑、在教学的尾声中设疑等问题，从而来激活学生思维。
By analysis of difficult points in underdrainage design at excavation section, the paper briefly introduces thinkings and methods for underdrainage design at excavation section.
通过对挖方段暗排设计难点的分析，简要介绍挖方段暗排设计的思路及方法。
These factors are both important and difficult points in ZTO-NP prescription design and preparation technique.
这三者是ZTO-NP处方设计和制备工艺研究中的重点和难点。
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