【Daily Question】520: Fixed Cold Water (February 4)

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This post was last edited by Zaihui Kangqiao on 2017-2-4 08:26. The Chemical Engineering Theory section is launching a \"One Question per Day\" activity starting today, aimed at helping everyone reinforce their basic knowledge in chemical engineering. Subsequent series will include those on \"Principles of Chemical Engineering\", \"Mass Transfer and Separation\", \"Thermodynamics in Chemical Engineering\", and \"Chemical Process Engineering\". We hope you will give it your active support! Wishing everyone a happy Spring Festival! Replies to the \"One Question per Day\" activity can be viewed directly at **; the thread will be closed after 1 day! ! To encourage everyone’s continued participation this year! Participation earns 3 wealth points, with an additional 4 wealth points for correct answers~~~ True or False: Without adding any chemicals, the copper content in chilled water should be kept at ≤40 ug/l. Wrong