A:NaOH+H2SO4=NaSO4+H2O
B:Fe+H2SO4=FeSO4+H2↑
C:2NaOH+CuSO4=Na2SO4+Cu(OH)2↓
D:2H2O 2H2↑+O2↑
______swimming here. It's dangerous.
亚洲地形的显著特征是: