题目内容

Which factor of the followling affects not only the fuel's combustion but also the engine's maintenance?

A. The cetane number.
B. The flash point.
C. The viscosity.
D. The setting point.

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Which factor of the followling affects the fuel's combustion?

A. The setting point.
B. The flash point.
C. The cetane number.
D. The mechanical impurities.

Which factor of the followling affects the engine's maintenance?

A. The calorific value.
B. The sulphur.
C. The cetane number.
D. The setting point.

药动学是研究

A. 药物作用随剂量变化的规律
B. 药物作用随时间变化的规律
C. 药物的体内过程及体内药物浓度随时间变化的规律
D. 药物作用随药物化学结构变化的规律
E. 吸收. 分布. 代谢. 排泄

新药进行临床试验必须提供

A. 临床前研究资料
B. 急慢性毒理研究数据
C. 系统要理研究数据
D. LD50
E. 新药作用谱