下列哪一结构将肾实质分为皮质和髓质 ["肾盂","弓形血管","肾脂肪","肾小球","小叶间动脉"]
论述扑救易燃建筑密集区火灾的战斗措施有哪些？
最不适用于成人颅脑超声检查的探头频率是 ["2.0MHz","2.5MHz","3.5MHz","4.0MHz","5.0MHz"]
下列哪一项不是早孕超声观察的内容 ["妊娠囊","胎芽","胎儿搏动","胎儿心脏结构","卵黄囊"]
胆囊管长时间阻塞可导致： ["瓷状胆囊","胆囊肿大","有分隔的胆囊","胆囊扭转"]
论述易燃建筑区火灾的特点是什么？
