What are nitrates used for?
A、Thescientistshavepreservedthecolorofmeats,butnotofvegetables.
B、Theypreservethecolorofmeats.
C、Theyaretheobjectsofresearch.
D、Theycausetheanimalstobecomefatter.
发布时间：2025-10-08 08:18:52
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