ThisdocumentisdraftedinaccordancewiththerulesgivenintheGB/T1.1—2020Directivesforstandardization-Part1:RulesforthestructureanddraftingofstandardizingdocumentsandGB/T20001.10—2014Rulesfordraftingstandards―Part10:Productstandards.Attentionisdrawntothepossibilitythatsomeoftheelementsofthisdocumentmaybethesubjectofpatentrights.Theissuingbodyofthisdocumentshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.