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Sagot :
Answer:
Seismographs, shipbuilding methods, and paper made from wood pulp
Explanation:
Zhang Heng, a Han scientist, developed the earliest known seismograph to detect and measure earthquakes. Cai Lun, an official in the Han court, invented a method for making paper out of wood pulp, and the Chinese made advances in methods of shipbuilding and invented the rudder to steer.
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