搜索
| 选项 | 甲 | 乙 | 丙 |
| A | NaOH溶液 | 稀H2SO4 | 浓H2SO4 |
| B | NaOH溶液 | 稀H2SO4 | NaOH溶液 |
| C | 饱和NaHCO3溶液 | 浓盐酸 | 浓H2SO4 |
| D | 浓H2SO4 | NaOH溶液 | 浓H2SO4 |
| A．A | B．B | C．C | D．D |
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
