简述软下疳与硬下疳的鉴别。
关于MRI眼图像的优点下列哪项不对() ["A．对晶状体没有X线辐射作用","B．能直接多方位成像","C．骨结构、钙化灶和异物信号强","D．对软组织有高清晰的分辨力","E．MRI对眶内容物、视神经和视交叉等软组织分辨力高"]
调节彩色多普勒血流显像的内容，错误的是() ["A．调节彩色增益","B．调节彩色滤波器","C．调节彩色速度标尺","D．调节脉冲多普勒取样容积","E．调节彩色取样框大小"]
眼科影像的常规检查不包括() ["A．X平片","B．超声波检查","C．DSA","D．CT","E．MRI"]
下列哪对脑神经与眼无关() ["A．第三对脑神经","B．第八对脑神经","C．第六对脑神经","D．第二对脑神经","E．第四对脑神经"]
肌无力危象时体检可见()胆碱能危象时体检可见()
