关于胆管结石的影像表现,哪项是错误的()
A.位于胆管走行区
B.一般不合并胆管壁增厚
C.可呈圆形、斑点状
D.结石水平以上胆管扩张
E.单发或多发
参考答案:B
This painting is so valuable that it is rather difficult to calculate _______ its price would be if the museum _______ to sell it.
A.how much; would want
B.what; wanted
C.what; wants
D.how much; wants
药物通过被动扩散吸收的机理,具有哪些特征()
A.耗能
B.不耗能
C.需载体
D.不需载体
E.顺浓度差通过生物膜