下列不会引起下消化道出血的疾病是（）。
A.急性细菌性痢疾
B.缺血性结肠炎
C.右膈下脓肿
D.结肠息肉
E.结肠癌
参考答案：C
That was the first time ______ I ______ face to face with the president. [ ]
A. when; had come
B. that; have come
C. when; came
D. that; had come
促红细胞生成素的主要作用是促进
A．早期红系祖细胞增殖、分化B．多能造血干细胞进入细胞周期C．晚期红系祖细胞增殖、分化D．幼红细胞增殖与合成血红蛋白
