[名词解释] 新生儿期(neonatalperiod)

试述儿童时期的三项基本特点。 蛛网膜下腔出血，CT检查最适宜的时间为() ["A．发病当天","B．发病1周后","C．发病10天后","D．发病2周后","E．发病1个月后"] 临床工作中按小儿年龄分为哪几期? 幼儿期(toddler’sage) 正常室间孔呈() ["A．“Y”字形","B．方形","C．长方形","D．三角形","E．梭形"] 新生儿期(neonatalperiod)