【Daily Question No. 117】April 27, 2018

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【Daily Question No. 117】April 27, 2018. The purpose of preheating the boiler circulation hot water pump is to prevent ( ). A. Uneven expansion of the pump body, resulting in thermal stress. B. Pump evacuation. C. Unstable flow rate. D. Water hammer. A. This question is valid for 48 hours; within those 48 hours, 10 points are awarded for a correct answer and 2 points for an incorrect one ； If the response is given after 48 hours, the score is halved, regardless of whether it is correct or not ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to the link below to access https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space – the special section for registered users, where the voting posts for the “My Registration Season” event can be found: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1954223. The APP video series and skill competition have now begun! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951670