When she saw me, she did't stop. She just walked _____. [ ]
A. from
B. on
C. to
D. up
B
NEC早期治疗过程中哪些征象出现需手术治疗()
A.X线片出现门静脉积气
B.腹肌紧张
C.腹腔有脓性液体
D.腹胀
E.大量便血
简述信息科学基础研究的八个方向。