X线束的最短波长取决于() ["A．毫安","B．时间","C．千伏","D．毫安秒","E．靶物质"]
X线束的最短波长取决于() ["A．毫安","B．时间","C．千伏","D．毫安秒","E．靶物质"]
试述肠梗阻的全身病理生理改变。
肾区及输尿管前后位摄片，中心线经() ["A．肚脐","B．肚脐下3cm","C．剑突到肚脐连线中点","D．肚脐到耻骨联合连线中点","E．剑突到耻骨联合连线中点"]
白癜风应与哪些皮肤病相鉴别?并述鉴别诊断要点。
简述面部盘状红斑狼疮(DLE)的皮损特征。
