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
The soldier fell asleep ________.
A. with the candle burning
B. burning the candle
C. when he was burning the candle
D. when burning the candle
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