A.铁与稀硫酸反应:2Fe+6H+=2Fe3++3H2↑ |
B.碳酸镁和盐酸反应:CO+2H+=H2O+CO2↑ |
C.氢氧化钡溶液与稀硫酸反应:Ba2++2OH-+2H++SO=BaSO4↓+2H2O |
D.碳酸氢钠溶液中滴入少量澄清石灰水:HCO+Ca2++OH-=CaCO3↓+H2O |
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