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【Daily Question No. 241】2018.09.04

2018-09-04View Original

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【Daily Question No. 241】September 4, 2018: At the point where hydrogen meets the feed oil, a ( ) is specifically installed to prevent backflow of materials. Fill in the blank: Check valve. Correct: 3 wealth, Incorrect: 1 wealth ; Mass posting of posts – rated based on the lowest score ; Replies that are unrelated to the answer are considered spam and will be deleted immediately. Due to management requirements, if you need to view content from several days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space via the summary thread below

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