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我国将琉璃使用于屋面始于()。
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中国营造学社的创始人是()。
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听力原文： Ladies and gents at Giant Systems, I'd like to thank you for inviting me and my colleagues from Final Data Co. to discuss some innovative methods for dealing with storing, retrieving, and transmitting data through satellites. Let me demonstrate to you some of our products and explain how those new machines work with the new satellite system. We have some visual aids prepared before starting the main presentation. But first, I am sure you might want some things clarified. Are there any questions？
What is the speaker's purpose in giving the talk？
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