浙江海洋大学鸥讯社：新媒体时代的校园媒体转型
百度 由于当时国内局势和经济形势依然很不乐观，所以物理学科研条件和物理学科知识储备十分短缺，很多方面的研究都是一片空白。
Media related to 13 July.
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July 13 is the 194th (195th in leap years) day of the year in the Gregorian calendar. There are 171 days remaining until the end of the year.
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1983 - Meter stamp catalog image, Brazil type DA7B variation 2 -
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External links
[edit]- "On This Day". BBC News. BBC. Retrieved on 2025-08-05.