单项选择题

The decomposed reaction of substance A and B is one order reaction, supposed the half life of t1/2(A)>t1/2(B),which answer is right about the activity energy?  
A、Ea(A)<Ea(B)
B、Ea(A)>Ea(B) 
C、Ea(A)=Ea(B) 
D、Uncertain

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问答题

小电动机是将电能转化为动能的装置,可以使转子转动更快的方法是()

答案: A.增大电流
B.改变电流方向
C.减少线圈圈数
D.改变线圈缠绕方向
正确答案:A
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