化学反应的瞬时速率是Δt=0时的速率。。。。。。,和
查看答案
Both the standard of living and the growth of real GDP per person vary widely across countries.
When net capital outflow is negative, it means that on net the value of domestic assets purchased by foreigners exceeds the value of foreign assets purchased by domestic residents.
尽量不要三个人一组,因为很容易其中的两个人结盟,让第三个人感到孤立。