5+8=13
You should use the computer to help you get more ____ (organize).
如图所示:甲、乙分别是“探究平面镜成像特点”和“探究凸透镜成像规律”的实验装置.
①
②
③
④
A
NaCl
K2SO4
KCl
(NH4)2SO4
B
NH4Cl
C
Na2SO4
D