供给X线管的能量,有百分之多少转换成X线() ["小于1%","4%","10%","85%","99%"]
在常有的管理方法中,最根本、最传统的是() ["行政方法","法律方法","思想教育方法","经济方法","社会心理学方法"]
急性胃炎常见的病因是()。 ["化学因素","物理因素","微生物感染","细菌毒素","以上均是"]
变压器具有瞬时过负荷的能力,X线机供电变压器的容量一般是计算容量的() ["1/6","1/5","1/4","1/3","1/2"]
急性胃炎最常见类型是()。 ["糜烂性","腐蚀性","单纯性","化脓性","萎缩性"]
4个月()8个月()11个月( )15个月( )24个月( )