We have the same problem as you concerning the learning of English.
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Totally alone in the room,her mother wanted to find someone to talk to.
I remained confused about the problem.
预测发生一级反应的药物,其半衰期
A. 与初始浓度C0无关
B. 与t时反应浓度有关
C. 与反应常数k无关
D. 与初始浓度C0有关
E. 与反应时间有关