氯霉素应用过程应定期查血象因为最易引起() ["血红蛋白下降","血小板下降","白细胞下降","血小板下降","红细胞增加"]
小脑扁桃体下疝畸形引起的脊髓损害主要为() ["脊髓受压","脊髓空洞","脊髓半横断损害","神经根痛","脊髓萎缩"]
现浇阳台栏板、栏杆按()计算。 ["水平长度","阳台外围长度","垂直投影面积","实体积"]
主动脉瓣狭窄的动脉脉搏呈() ["上升缓慢,洪大而持续","上升缓慢,细小而持续","上升急促,洪大而持续","上升急促,细小而持续","上升缓慢,细小而间断"]
脊髓空洞症最常见于下列哪种疾病() ["小脑扁桃体下疝畸形","颅底陷入","颈椎分节不全","寰枕融合","扁平颅底"]
某钢厂有三座转炉,某日1#转炉消耗铁水量为1586.3吨,2#转炉消耗铁水量为1455.6吨,3#转炉消耗铁水量为1668.2吨,求该厂这天的平均铁水消耗是多少?