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What step is essential to the traditional production of flu vaccine?

单选题
2022-01-03 04:01
A、[A] Manufacturers implant the vaccine into ordered chicken eggs.
B、[B] Scientists identify the exact strain soon after a flu pandemic starts.
C、[C] Public health measures are taken as an important pandemic-fighting tool.
D、[D] Viruses are deadened and made clean before being put into vaccine use.
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正确答案
D

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