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RE: 我的新书《大话区块链》现在京东有官方预售了

in #blockchain5 years ago

Congratulations @yingpingzhang! You have completed the following achievement on the Steem blockchain and have been rewarded with new badge(s) :

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To support your work, I also upvoted your post!

Vote for @Steemitboard as a witness to get one more award and increased upvotes!