患者男性,36岁,跑步训练课上突然晕厥,意识丧失,呼吸心跳停止。为其做胸外心脏按压时,按压部位及抢救者双手的摆放要求是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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