What is the material of pure carbon steel (a3 carbon steel heat treatment)

201. The steel frying method invented in the Han Dynasty uses pig iron as raw material to produce high-carbon steel, medium-carbon steel, and low-carbon steel. ____A. Correct B. Incorrect 202, Han Que, is a building built in ____ of the Han Dynasty outside the city gate or the gate of the building complex to express the dignity and rank of the building. A. Pair B. Single 203. The Hongshan culture is a Neolithic culture in northern China, and most of its residents live a life of ____. A. Settling down B. Nomadic 204. Bamboo slips are the most basic form of slips, or letters, made of bamboo or wood. Generally about 23 cm long, which is equivalent to the Chinese ruler ____. A. Two feet B. One foot 205. Bamboo slips are writing materials made of ____ in ancient China, popular in the Eastern Zhou Dynasty to the Wei and Jin Dynasties (about the 5th century BC to the 3rd century AD). A. Bamboo, wood B. Silk C. Paper 206. The Liangzhu culture is a Neolithic culture in the lower reaches of the Yangtze River in China. It is named after the Liangzhu site in Yuhang County (now Yuhang District), Hangzhou City, Zhejiang Province. Residents of Liangzhu Culture mainly engaged in agricultural production, and the main crop was ____. A. millet B. rice C. millet 207, Longquan kiln site is

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