下列哪种X线征象是食管静脉曲张与食管癌的鉴别要点()
A.串珠状充盈缺损
B.管腔边缘凹凸不平
C.蠕动减弱,钡剂通过缓慢
D.纵行黏膜皱襞消失
E.管腔扩张及舒缩性存在
参考答案:E
已知单项式-4xm+nym-n与3x7-ny是同类项,则m=( ),n=( )。
In Nathaniel Hawthorne's The Scarlet Letter, Reverend Dimmesdale succumbed to Hester's charms.
A.appealed to
B.conversed about
C.cared nothing for
D.yielded to