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what’s difference of HCM and second-order?

Posted: Sat Aug 01, 2020 2:21 am
by vivian1020
Dear Sir
hello! when i draw a model, somebody ask me why i say it is second-order, not HCM? i feel that are same. but i do not know how to explain. so would you please tell me? i also want to know what the difference it is. thanks a lot!!!

Yours Regard