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Please Help me I really need help

Which of these was an accomplishment of the Han Dynasty?
the invention of the seismograph

finding a water passage to Europe

the invention of the ballpoint pen

the invention of the abacus

Respuesta :

Jhayson

answer

The first (if you can say it that way) seismograph was invented by the scientist and astronomer Zhang Heng, a fact that took place during the regency of the Eastern Han dynasty.

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