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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
问题（）is not included in the main contents of the operation and maintenance of the information
（）isnotincludedinthemaincontentsoftheoperationandmaintenanceoftheinformationsystem.A.Dai