联合用两种药物,其总作用大于各药单独作用的代数和,这种作用叫做( )。
A. 拮抗作用
B. 相加作用
C. 协同作用
D. 互补作用
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This novel coronavirus is definitely a ________(毁灭性的)episode that has happened to us.
CO代表的是________VI 代表的是_______D代表的是 _______
For now, the evidencealso suggests that ________(传播)is mostly via droplets.
There're three reasons why it didn't spread more. The first is that there was a lot of ______(英雄事迹) by the _______(医务工作者).