A:福尔马林
B:18.4 mol•L﹣1的硫酸溶液
C:饱和Na2SO4溶液
D:1 mol•L﹣1的CuSO4溶液
— What would you like in the future?
— I want to been engineer I grow up.
已知关于x的方程(2a+b)x﹣1=0无解,那么ab的值是( )