选项 | 物质(杂质) | 试剂、操作方法 |
A | MnO2固体(KCl) | 加水溶解、过滤、洗涤、干燥 |
B | CO2(CO) | 点燃 |
C | Fe(NO3)2溶液[Cu(NO3)2] | 加入过量的铁粉、过滤 |
D | 稀硝酸(稀盐酸) | 加入适量硝酸银溶液、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