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??. ????????????? ?????????? P2?????????? ????????????? ??????????? ????? P2???????????P2?????? . ??????????? P2?. ???97.11.. ??????????. Biosafety levels???????(BSL-1) ???????(BSL-2)???????(BSL-3)???????(BSL-4)?????P1-P4. ???????(BSL-2). BSL-2?BSL-1?????????????????????????,????
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