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- 1931 年金本位制的废除the ending of the gold standard in 1931
- 美国发明家（1847-1931）。American inventor (1847-1931).
- 高kHigh-k
- 那里在秋天的1931个两重新开始了他的宋手册的较早研究。There in the autumn of 1931 Liang resumed his earlier study of the Sung manual.
- K肥K fertilizer
- 传奇发明家托马斯·爱迪生死1931.10.18，享年84岁。Legendary inventor Thomas Alva Edison died on October 18, 1931, at the age of 84.
- （kk
- k/nk-out-of-n
- 快点来听！黑夜中孩子的声音是他们缔造的美妙音乐。（《吸血鬼》1931）Listen to them. Children of the night. What music they make.
- K泡potassium bubble
- 编导:李仲林(1933--)、黄伯寿(1931--)作曲:张肖虎，首演者:中央实验歌剧院舞剧团，The choreographers: Li Zhonglin [1933- ] and Huang Boshou [1931- ];composer: Zhang Xiaohu;premiere staff: the dance troupe of the Central Experimental Opera Troupe;
- K镜K mirror
- K相K phase
- 霞飞，约瑟夫 雅克 塞泽尔1852－1931法国野战军团元帅，在第一次世界大战中他指挥在法国的盟军French field marshal who commanded the Allied armies in France during World War I.
- K-BK-B
- 在欧洲近现代小提琴艺术发展史中,欧仁·伊萨依(Eugene Ysaye,1858-1931)占据着特殊的地位。In the European art history near of modern violin, (Eugene Ysaye, 1858-1931) is occupying the special status.
- K=1K=1
- K-LKarhunen-Loeve
- K均值K-means
- K分布K-distribution
