這位是搞化學的內行。休斯頓那麽多化學公司，怎麽據說會缺一種做口罩的化工材料，需要中國進口？

來源: wohaizai 於 2020-04-02 21:06:10 [舊帖] [給我悄悄話] 本文已被閱讀：次

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