题目内容

维生素B12可用于治疗

A. 恶性贫血
B. 巨幼红细胞性贫血
C. 神经炎
D. 哮喘
E. 肝脏疾病

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有关对香豆素类的叙述正确的有

A. 维生素B12的拮抗剂
B. 口服可吸收
C. 起效慢
D. 对已形成的凝血因子无抑制作用
E. 持续时间短

下列关于肝素的叙述正确的有

A. 抑制血小板聚集
B. 体外抗凝
C. 体内抗凝
D. 降血脂作用
E. 带大量负电荷

_____ in thought, he almost ran into the car in front of him.

A. Lost
B. As he was lost
C. He lost
D. A and B

_______for the bus at the stop, he suddenly caught sight of a thief.

A. Waiting
B. When he was waiting
C. As he was waiting
D. all the above