A:NH3·H2O 的导电性比NaOH溶液弱得多
B:0.1mol/L 的NH3·H2O 的pH值大于7
C:NH4Cl 的水溶液的pH值小于7
D:5mL 1mol/L的NH3·H2O跟10mL 0.5mol/L的HCl恰好完全反应
—Your T-shirt is nice. It must be expensive.
—Not at all. I only spend $10 it.
先化简分式a3-4a2+4aa3-4a,然后在0,1,2三个数值中选择一个合适的a的值代入求值.
Why not ____ your teacher for help when you can't finish _____ the story by yourself?
下列词语中加线字的读音完全正确的一项是( )。