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根据以下资料回答 51～55 题
第 51 题（）进货价格（）出厂价

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What does Prof. Lee need to do if he wants to give some talks？
He is required to __________ them in advance.

（）电气系统（）单项驱动

What is required to mail to Tianhe together with their resumes？
_______________________.

When will the conference be held？
It will be held on __________.