[問題] Merck. Sigma. Alfa Aesar...無可取代?
想請教實驗室常見的化學品、標準品、溶劑...等
為什麼都慣用Merck. Sigma. Alfa aesar...品牌,不可動搖?!
有什麼同等級品牌可以替換?(HPLC. LC. GC...儀器)
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