题目内容
It is generally accepted that Suzhou is the silk capital of China.
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The Silk Road was the main trade route running through Asia in ancient times.
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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