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26.If 0.5 mL of a mumps virus vaccine contains 5000 units of antigen, how many units would be present in each milliliter if the 0.5 mL of vaccine was diluted to 2 mL with water for injection? 27.A sample of Oriental ginseng contains 0.4 mg of active constituents in each 100 mg of powdered plant. ................
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