关于肝血管瘤的说法,下列哪一项是错误的:
A.强回声结节
B.低回声结节
C.加压探头后,病灶变形
D.后方回声不增强
E.病变内发现钙化灶即可除外血管瘤
参考答案:E
Not until _________ did man accept that fact that all living things must die.
A.did many years pass
B.many years past
C.many years had passed
D.many years have passed
相标志是指最能反映(),它是相分析和岩相古地理研究的基础。