选项 | 实验目的 | 实验操作 |
A | 除去CaCl2溶液中的少量盐酸 | 加入过量碳酸钙充分反应后过滤 |
B | 除去CO2中少量的CO | 点燃 |
C | 鉴别固体(NH)2SO4和K2SO4 | 分别取样,加熟石灰研磨,闻气味 |
D | 除去氯化钠中少量氯化钙、氯化镁 | 用饱和氯化钠溶液浸洗、过滤、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