真性红细胞增多症的发生() ["与病毒感染有关","与射线有关","与药物毒性有关","与免疫异常有关","原因未明"]
眼球壁的构成为()。 ["角膜、脉络膜和视网膜","外膜、脉络膜和内膜","纤维膜、血管膜和视网膜","巩膜、睫状体和脉络膜","纤维膜、睫状体和视网膜"]
头颈部DSA检查不能将导管置于() ["颈动脉","椎动脉","锁骨下静脉","锁骨下动脉","右头臂动脉"]
下列哪种病人慎用羟丁酸钠() ["高血钾","低血钾","高血钙","高血钠","低血钙"]
直肠下1/3锐器插入伤处理原则()。 ["冲洗创口,清创缝合","清创缝合创口,直肠周围间隙引流","不缝合创口,只行直肠周围间隙引流","剖腹行乙状结肠造口,冲洗下端肠腔,修补损伤","剖腹行乙状结肠造口,冲洗下端肠腔,修补损伤,引流直肠周围间隙"]
简述先天性心脏病的分类。