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We use hash algorithms to make sure that an attachment is the one we directly provide to users and that it has not been maliciously changed by others. You may use a verification tool to see if an attachment’s hash value matches its hash verification code listed on this website (please remember to use SHA256). Thank you.
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3.水公司授課-混凝、膠凝及沉澱原理功能.pdf
雜湊值驗證碼(SHA256)： 3A618C0512A1F60D008EC8AEDC3B9F45DA6C9C1F3426D2DFBDD2304921ADE151