多项选择题

以下哪些属于中心投影？
A、电影
B、幻灯片
C、建筑效果图
D、素描

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清代皇帝冠服，有（ )等。

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单项选择题

Half.com’s Take Five! Program is another example of viral marketing, where registered users at the site selling used books, music, movies, and games are given an incentive, such as coupons to tell their friends about the website reflect ________.

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