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Principal Accounting Policies - Convenience translation (Details)	Dec. 31, 2019
Convenience translation
Convenience translation, noon buying rate of US$ using RMB	6.9618

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- Definition

Convenience Translation [Abstract]

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No definition available.

+ Details

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- Definition

The noon buying rate as set forth in the H.10 statistical release of the U.S. Federal Reserve Board at which translations of amounts from RMB into US$ for the convenience of the reader were calculated at.

+ References

No definition available.

+ Details

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Period Type:	instant