X线管焦点、肢体和胶片间相互关系如何?
典型先天愚型的诊断依据是() ["A．智力低下","B．特殊面容","C．皮纹特点","D．染色体检查","E．腹胀便秘"]
先天愚型的临床特点为() ["A．体格发育迟缓","B．智力低下","C．特殊面容","D．面色苍黄、皮肤粗糙","E．眼睑水肿"]
21-三体综合征核型可为() ["A．47，XX(或XY)，+21","B．46，XX(或XY)，-21，+t(21q21q)","C．46，XX(或XY)，-14，+t(14q21q)","D．46，XX(或XY)/47，+21","E．47，XXY"]
白细胞内特异性酶缺陷有助于下列哪些类型糖原累积症的诊断() ["A．糖原累积症Ⅱ型","B．糖原累积症Ⅲ型","C．糖原累积症Ⅵ型","D．糖原累积症Ⅸ型","E．糖原累积症Ⅶ型"]
什么叫做感光效应(PE)?它和哪些投照因素有关?
