Why is glue 502 named "502"?

Your 502 is just two common models of super glue, named according to the group types in the main components of super glue. For example, methyl ester is 1 and named as 501; Ethyl ester is 2, named 502; Propyl is 3, named 503, and so on.

Case study of folk village planning

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Ask for the answer and guess () who has no head; () What tree has no roots; () What lights don't work; (

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