选项 | 实验目的 | 实验方案 |
A | 区别稀盐酸和氯化钠溶液 | 滴加酚酞观察现象 |
B | 检验生石灰是否变质 | 滴加酚酞观察现象 |
C | 除去KCl固体中的MnO2 | 溶解后过滤 |
D | 除去FeSO4溶液中少量的CuSO4 | 加入足量的铁粉充分反应后过滤 |
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