A:Na+、Fe3+ 、NO3-、Cl-
B:Ag+、NH4+、Cl-、Br-
C:K +、SO42-、Cl-、Mg2+
D:NH4+、Na+ 、OH-、CO32-
圆柱的侧面积=____×____. 圆柱的表面积=____+____.
What's this? It's a tiger.