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China firstly used gunpowder for military purposes. ______
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As for September 2018, Tianyan has found 62 high-quality pulsar in the universe. ______
Till the end of 2015 China’s high-speed railway has reached more than 18,000kilometers, ranking first in the world. ______
Online shopping reduces the selling price of goods because the costs of merchandise are low. ______
在力的作用下，其内部两点之间距离保持不变的物体称为刚体。
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