肝素、双香豆素
A.脑保护剂
B.抗凝治疗
C.溶栓治疗
D.血液稀释疗法
E.脑代谢活化剂
参考答案:B
二次电池有何共同特点?
I don't have a soccer ball _______ I have a volleyball. [ ]
A. and
B. but
C. or
D. so