哪项不是脊柱动脉瘤样骨囊肿的CT表现()
A.多为囊性、膨胀性改变
B.可见囊肿骨壳
C.病变内部可见分隔改变
D.附件常受累
E.骨外可见软组织肿胀
参考答案:E
I’m glad you’ve come back from the United States. Please tell me how long you ____there.
A.have stayed
B.had stayed
C.have been staying
D.stayed
可以确定化合物分子量的波谱技术是
A.红外光谱B.紫外光谱C.质谱D.磁共振光谱E.旋光光谱