China plays an important role in the field of inventing calculating devices. Which was the first calculating device invented by the Chinese?

China plays an important role in the field of inventing calculating de

1.	China plays an important role in the field of inventing calculating devices. Which was the first calculating device invented by the Chinese?
A.	Chang su calculator
B.	Napier's bones
C.	Leibnitz calculator
D.	Abacus
E.	None of these
Answer» E. None of these

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China plays an important role in the field of inventing calculating devices. Which was the first calculating device invented by the Chinese?

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