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12 14 20 38 ()A.46 B.52 C.64 D.92
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12 14 20 38 () A.46 B.52 C.64 D.92
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0,12,24,14,120,16,()A.280 B.32 C.64 D.336
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12,14,20,38() A.46 B.38 C.64 D.92
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12, 14, 20, 38, ()A.146 B.38 C.64 D.92
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16 4 12 14 20 ()。A.27B.34C.16D.38
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已知聚山梨酯60(HLB值为14.9)与司盘20(HLB值为8.6)按一定比例混合后的HLB值为12. 38 则两者的混合比应为