下面哪种组织对超声传播阻力最小() ["A．肌肉","B．脂肪","C．骨骼","D．血液","E．气体"]
梅毒常见的传播途径有以下几种() ["A．性接触传染","B．胎盘传染","C．产道传染","D．输血传染"]
眼在调节放松(静止)状态下所能看清的最________一点称为________。
当障碍物的直径大于1/2波长时，将会发生什么反应() ["A．反射","B．折射","C．衍射","D．不反射","E．不折射"]
有关灌肠的禁忌证，下述哪项是错误的() ["A．阴道出血．胎膜破裂．先露未衔接","B．臀位、横位","C．估计1小时内结束分娩","D．枕横位及枕后位","E．严重妊娠中毒症及心脏病"]
为看清近物而改变眼的屈光力的功能称为眼的________________________。
