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[问答题,简答题] 试述莫氏Ⅱ型房室传导阻滞的心电图特点。

二尖瓣脱垂综合征患者出现室性早搏和阵发性室速时,首选() ["维拉帕米","艾司洛尔","利多卡因","硫酸镁","普罗帕酮"] 与肝脏DSA检查技术无关的是() ["采用Seldinger技术","行股动脉或肱动脉穿刺插管","先行选择性腹腔动脉造影","导管插入肝门静脉","选用50%~60%离子型或非离子型对比剂"] 下列结构中无屈光作用的是()。 ["玻璃体","角膜","房水","虹膜","晶状体"] 肝左动脉起源于() ["肝总动脉","腹腔动脉","腹主动脉","胃十二指肠动脉","肝固有动脉"] 引起类白血病反应的最常见病因是() ["术后","创伤","过敏","溶血性贫血","感染和肿瘤"] 试述莫氏Ⅱ型房室传导阻滞的心电图特点。
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