A.将铜丝插入稀硝酸中:Cu+4H++2NO3-=Cu2++2NO2↑+H2O |
B.向Fe2(SO4)3溶液中加入过量铁粉:Fe3++Fe=2Fe2+ |
C.向Al2(SO4)3溶液中加入过量氨水:Al3++3NH3·H2O=Al(OH)3↓+3NH4+ |
D.向Na2SiO3溶液中滴加稀盐酸:Na2SiO3+3H+=H2SiO3↓+3Na+ |
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2