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3. 1.(2) ???????????????,??????? ????????? (1) 5?? (2) 6?? (3) 7? ? (4) 7.5??? 2.(1) ????????????????? (1) ???? ????????? (2) ???? (3) ???? (4) ?????? 3.(3) ???????pH??? (1) 4~5 (2) 5~5.5 (3) 5.8~6.5 (4) 7~8 ??? 4.(3) ???
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