30.[单选题]With authorization from the public,_and digital travel records have been employed as permits for making trips,going to school or work,and accessing certain public venues,and for other daily errands.The results shown on the codes and records provide a base for travel control and differentiated response measures,which has made risk identification and targeted control possible in different areas and at different levels.A health QR codesB health codes

30.[单选题] With authorization from the public,_and digital travel records have been employed as permits for making trips,going to school or work,and accessing certain public venues,and for other daily errands.The results shown on the codes and records provide a base for travel control and differentiated response measures,which has made risk identification and targeted control possible in different areas and at different levels. A health QR codes B health codes

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