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並前往https://www.federalregister.gov/documents/2010/06/29/2010-15518/exempt-chemical-mixtures-containing-gamma-butyrolactone

Exempt Chemical Mixtures Containing Gamma-Butyrolactone

Gamma-Butyrolactone, or GBL, is a chemical that is used as a ... with higher concentration limits such as solvent-based mixtures (e.g., ...

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