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古都北京的布局形成于十五世纪以故宫为中心对称建造。全长7.7公里的中轴线是北京的中心标志。北京有故宫、天坛、长城等宏大建筑。The __ of Beijing formed in the 15thcentury.The Imperial Palace is the center of the city’s symmetrical layout. The 77-kilometre long _ is the symbol of Beijing. There are grand examples of Chinese architecture, such as , __ and the Great Wall.

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同时也有京剧、脸谱等丰富的传统民间艺术，糖葫芦、烤鸭等多样的饮食文化。, such as Peking Opera and traditional foods, such as sugar-coatedhaws on a stick and _ are famous worldwide.

2008年奥运会在这里成功举办。北京在保存传统的同时更加开放。北京欢迎你！北京欢迎你！The Olympics Games was here in 2008. While , Beijing is becoming more and more open. Welcome to Beijing!

含碳量是4.3%的铁碳合金发生共晶反应得到的是（）组织。

A. 铁素体
B. 奥氏体
C. 莱氏体
D. 珠光体

逻辑描述的方法有（）

A. 真值表
B. 逻辑电路图
C. 逻辑表达式
D. 逻辑波形图