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The 2018 "valve strategic development seminar" was successfully held
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The 2018 World unmanned aerial vehicle Championship shook the opening
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[2018 orientation] the school of mechanical engineering successfully c
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The 2018 working conference on statistical information of bearing indu
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2018 annual conference and exhibition of water-based technology opened
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SIP (Session Initiation Protocol) is a text-based application layer co
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