多项选择题

绘制思维导图时，要把握以下原则：
A、布局合理，层次分明
B、每条线上有一个关键词
C、关键词要简短，且有较强的概况性
D、一定要有图片

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单项选择题

Which statement of research approach is NOT correct?

A．Demand oriented is that we find some interesting scientific problems.
B．Demand oriented emphasizes more in solving the problem.
C．Methodology oriented approach is that we choose topic in mathematical areas.
D．There are some difficulties in properly using methodology properly.

[填空(2)]在线缝组合工艺中，缝沿和外底所用的缝线是什么？

答案：苎麻线