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LiuLan, your best friend, has gone to America to study. You would like to write apost card to her to ask if she has become used to the life there and to tellher that you miss her very much. You write to this address：2312Milford Avenue, Duluth, Minnesota 55812.
Write a post card to your partnerabout an interesting place you have just visited. Then exchange post cards withyour partner.
乙醇-环己烷在常压下形成共沸体系，其自由度为（）
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