题目内容
The Silk Road was the main trade route running through Asia in ancient times.
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From the Eastern Han dynasty on, China's silk was exported through this route to the West, and thus a closer link between China and the West was formed, and cultural exchanges and friendly visits were promoted.
砂垫层的厚度如何确定?
圆水准器轴是圆水准器内壁圆弧零点的
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