选项 | 实验目的 | 实验设计 |
A | 鉴别H2O2溶液和H2O | 加入MnO2 |
B | 鉴别NaCl溶液和NaOH溶液 | 滴加CuSO4溶液 |
C | 除去H2中混有的少量CO | 通过灼热的CuO |
D | 除去木炭粉中混有的氧化铁 | 加入足量稀盐酸,过滤、洗涤、干燥 |
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