何谓体外授精与胚胎移植?
脾切除的并发症有()。 ["腹腔内大出血","膈下感染","血栓-栓塞性并发症","凶险性感染","肺部感染"]
心肌梗死急性期患者,一旦出现室性期前收缩,应首选()。 ["美托洛尔","维拉帕米","利多卡因","地西泮(安定)","苯妥英钠"]
左乳内动脉最常用于哪一支冠脉的旁路移植() ["右冠状动脉","锐缘支","后降支","前降支","钝缘支"]
血栓闭塞性脉管炎的健康指导是()。 ["绝对忌烟","指导肢体运动","注意防寒保暖","患肢防创伤","保肝治疗"]
如何进行性交后试验?有何临床价值?