骨髓活检示造血组织减少,脂肪组织增加,最可能的情况是()
A.再生障碍性贫血
B.溶血性贫血
C.缺铁性贫血
D.巨幼细胞贫血
E.急性粒细胞白血病
参考答案:A
We _____ on this project for four hours. Let's have a rest. [ ]
A. are working
B. have been working
C. worked
D. had worked
宁天城际列车越出站台停车标5米以外,司机采用RMR模式,隔离(),以低于10km/h速度后退对标,对标后需将模式开关转至手动位再开门,开关门作业完成后,汇报行调动车。