【Pump Technology Edition: Daily Question】April 11, 2020 (Random forum members who answer correctly before the answers are released will be rewarded with 10 wealth points)

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The maintenance capacity of the 161 equipment: th=1938. The base surface on which the secondary grouting is applied must be washed clean with water and made wet. When the ambient temperature is below ( ) °C, anti-freezing measures should be taken, and surface water accumulated on the foundation should be removed. A、-10 B、0 C、5 (The answers are revealed the day before they are made public; those who get it right before the announcement will have a few lucky forum members randomly selected to receive 10 wealth points each, while those who get it right after the announcement will receive 5 wealth points. Knowledge is priceless, but participation is what matters.) I’ve been a bit busy lately, so I’m slower at posting questions and giving feedback on answers. But no matter how busy or late it gets, I will still post questions and respond to everyone. It’s for the development of the forum, as well as for the benefit of its members. Thank you very much for your support, and I also thank my friends who have supported me throughout this journey. Thank you all.