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I thought you might be interested in looking at Tìm hiểu về đầu phun nước Sprinkler trong hệ PCCC.
http://diendan.lyhoclacviet.vn/chu-de/55745-t%C3%ACm-hi%E1%BB%83u-v%E1%BB%81-%C4%91%E1%BA%A7u-phun-n%C6%B0%E1%BB%9Bc-sprinkler-trong-h%E1%BB%87-pccc/?do=findComment&comment=275521
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