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One question per day; those who answer correctly receive 5 wealth points, and those who participate receive 2 wealth points； Question 309 [

2016-06-08View Original

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Selection: Isopentane has none ( ). A. Primary carbon B. Secondary carbon C. Tertiary carbon D. Quaternary carbon C. Tertiary carbon
Reply #22016-06-08
I don’t know any of these relatives
Reply #32016-06-08
On the rooftop, these relatives represent the east, south, west, and north!

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Translated at 2026-07-21 00:06:39

Original: https://bbs.hcbbs.com/thread-1591833-1-1.html

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