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According to the historical records of the Chinese nation (Qi Huan Gong and Guan Zhong), the earliest state-owned enterprises were established because of ( ).
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The color of food is the color of ( ) after reflecting white light in nature.
There are two idioms in China that say "One word is as heavy as nine tripods" and "find for the tripod in the central plain". What is the meaning of tripod?
The first man-made tool was ( ).
At present, the earliest evidence about using fire by ancestors found in China is ( ).
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