单项选择题

历史上的黑死病几乎摧毁了整个欧洲，有1/3 的人死于这场灾难，该病是由（）引起的。

A．天花病毒
B．鼠疫杆菌
C．肺炎链球菌
D．伤寒沙门氏菌

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多项选择题

下列哪个选项属于Me-too药物的专利边缘的创新策略

A．改变粒度
B．局部化学结构进行改造
C．随机筛选
D．引入杂原子

单项选择题

The figure shows the relationship between shear stress and velocity gradient for two fluids, A and B. Which of the following is a true statement?（）。

A．Absolute viscosity of A is greater than that of B
B．Absolute viscosity of A is less than that of B
C．Kinematic viscosity of A is greater than that of B
D．Kinematic viscosity of A is less than that of B