实验 | 实验操作和现象或结论 |
1 | 用试纸测量溶液的,测得约为5 |
2 | 向溶液中加入等体积氨水溶液,充分混合,溶液约为9 |
3 | 向溶液中滴加几滴溶液,无明显现象 |
4 | 向溶液中加入溶液,产生白色沉淀 |
A.实验1可得出: |
B.实验2所得溶液中存在: |
C.实验3可得出: |
D.实验4两溶液混合时有: |
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