为了提高加氢反应的深度,可适当提高氢分压,提高氢分压的正确方法有()。
A、降低尾氢排放量
B、提高反应系统压力
C、提高循环氢的纯度
D、降低氢气纯度
参考答案:B, C
— What do you usually do in the afternoon, Mrs. Smith?
— My afternoon ______ includes doing some shopping and walking my dogs.
[ ]
A. appointment
B. action
C. routine
D. performance
什么是三联体?