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Daily Question 7.9

2011-07-09View Original

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1. The rotating parts of mechanical equipment can be cleaned or removed during operation. （ ） 2. Among 30% nicotinic acid, 21.5% nicotinic acid, and 65% nicotinic acid, 30% nicotinic acid has the highest freezing point. （ ） Wrong, Right
Reply #22011-07-09
Reply 1# A Shan Wrong Right
Reply #32011-07-09
Reply 1# A Shan Wrong Right
Reply #42011-07-09
This post was last edited by cjzhou2 on 2011-7-9 08:36. The first question is incorrect; I don’t know the answer to the second question.

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Translated at 2026-07-25 03:27:37

Original: https://bbs.hcbbs.com/thread-869063-1-1.html

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