在一定温度下,活化能(),反应()。
参考答案:愈大、愈慢
--- You never feel worried before an exam, how can you?
---Well, I’ve been working hard all the time. Surely I am _________ any exam.
A.interested in
B.afraid of
C.busy with
D.ready for
水泥中的碱含量是由K2O、Na2O和游离CaO组成。