【Daily Question No. 003】2018.01.03

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【Daily Question No. 003】01.03.2018 Which of the following does not belong to the valve core structure? （ ） A. Flat type B. Plunger type C. Open type D. Semi-open type. D. For management purposes, if you need to view content from a few days ago, please go to the summary post below. 2018 Hydrogen Production and Refueling Technology Section – Daily Question Summary Thread: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888971
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