A.3份體積的0.2%溴甲酚綠-乙醇溶液和1份體積的0.2%甲基紅乙醇溶液 B.5份體積的0.2%溴甲酚綠-乙醇溶液和1份體積的0.2%甲基紅乙醇溶液 C.5份體積的0.2%溴甲酚綠-乙醇溶液和3份體積的0.2%甲基紅乙醇溶液 D.1份體積的0.2%溴甲酚綠-乙醇溶液和5份體積的0.2%甲基紅乙醇溶液
A.15±0.5 B.10±0.5 C.5±0.5 D.3±0.1
A.5 B.3 C.1 D.0.5