化学反应速度常数首先决定于反应物的性质，随（）改变。
A、浓度
B、温度
C、催化剂
D、体积
参考答案：B, C
Everyone can play an important part in society. As members, we should try our best to do __ .
A. how we should do B. what should we do
C what we should do D. how should we do
简述数控夹具与传统夹具的差别？
