选项 | 待鉴别的物质 | 实验设计 |
A | 氢氧化钙溶液和氯化钙溶液 | 分别取少量滴加稀盐酸 |
B | 一氧化碳和氢气 | 分别点燃并在火焰上方罩一个干燥的冷烧杯 |
C | 棉线和羊毛线 | 分别取适量灼烧,闻气味 |
D | 碳酸钠和碳酸钙 | 分别取少量加足量的水,搅拌 |
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