The main infection source of epidemic type B enecphalitis virus is（)A．patientB．health

The main infection source of epidemic type B enecphalitis virus is() A．patient B．health carrier C．young pig D．culicine E．10use 请帮忙给出正确答案和分析，谢谢！

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问题The main infection source of epidemic type B enecphalitis virus is（)A．patientB．health
ThemaininfectionsourceofepidemictypeBenecphalitisvirusis()A．patientB．healthcarrierC．youn

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