诊断纵隔畸胎瘤的特征性CT征象是()
A.肿块位于前上纵隔
B.肿块有分叶
C.肿块内有齿样骨化
D.肺内转移
E.以上都不是
参考答案:C
除数一定比余数大.______.
My brother gave me a present for my birthday but I gave him nothing ______ his.
A.in return
B.by turns
C.in turn
D.in return for