A:2H2(g)+ O 2(g) = 2H2O(1)H = —142.9kJ·molˉl
B:2H2(g)+ O 2(g) = 2H2O(1)H = —571.6kJ·molˉl
C:2H2+O2 = 2H2OH = —571.6lkJ·molˉl
D:H2(g)+O 2(g) = H2O(1)H = +285.8kJ·molˉl
读图,回答问题。
You can ____ the word ____ something interesting.
People have been complaining about SK-II recently and think the advertisements always persuade people _________ the products which are not so good. ( )
用分组分解法把ab-c+b-ac分解因式,分组的方法有( )