题目内容
蛙心插管的操作步骤包括：①剪断主动脉左右分支，②在主动脉干下方引线2根，③在心室收缩期插入插管，④在静脉窦与腔静脉交界处结扎，⑤结扎主动脉干上端。正确的操作顺序是：
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[音频]Andy and Donna are good friends. Donna is recovering from a 1 (bike, car, bus) accident and she still feels rather 2 (sick, weak, sad) now. Andy comes to see Donna. Donna gives her heart-felt thanks to Andy for sending her a 3 (gift, thank-you, get-well) card the day before. She thinks that Andy is very 4 (careful, thoughtful, helpful). She also expresses her love for the beautiful flowers Andy has brought her. These flowers are from Andy's 5 (niece's, father's, sister's) garden. They are so fresh and look so nice. Donna keeps them right on the 6 (desk, counter, table) beside her bed. When it's time to say goodbye, Andy asks Donna to 7 (take a rest, take care, take leave).
儿茶酚胺类药物的筛选及对血压的作用实验中，没有使用的试剂是
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