A:0.1
B:0.15
C:0.2
D:0.3
I'm going to ____ a computer ____ ____ as a present.
①CaCl2溶液;②Na2SiO3溶液;③Ca(OH)2溶液;④饱和Na2CO3溶液.
最终溶液中有白色沉淀析出的是( )