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[问答题] 试述房间隔缺损的临床症状、心脏体征及X线检查、心电图特点。

关于虹膜的描述正确的是()。 ["是眼球壁的最前部","是房水与玻璃体的分界","参与晶状体曲度的调节","与巩膜交界处构成虹膜巩膜角","颜色有明显的种族差异"] Q-T间期延长综合征患者术前处理最关键的措施() ["心电图检查","充分给予普萘洛尔等β受体阻滞药","充分镇静","作心功能检查","术前不宜应用阿托品"] 用于治疗口腔念珠菌病的碳酸氢钠溶液浓度范围为() ["A.2%~4%","B.1%","C.5%","D.10%","E.0.1%"] 原发性血小板增多症患者,其外周血血小板数至少大于() ["1000×109/L","1100×109/L","1200×109/L","1300×109/L","1500×109/L"] 肾后型急性肾衰竭常见的原因() ["肾中毒","挤压伤","大出血、休克","双侧输尿管结石","蛇咬伤"] 试述房间隔缺损的临床症状、心脏体征及X线检查、心电图特点。
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