选项 | 实验操作及现象 | 结论 |
A | 将金属钠投入到硫酸铜溶液中发生剧烈反应 | 金属性: |
B | 常温下将铁片分别插入浓盐酸和浓硝酸中,前者产生无色气体,后者无明显现象 | 氧化性:浓浓 |
C | 常温下用试纸测得:溶液的约为溶液的约为8 | 酸性: |
D | 向和的混合溶液中加入溶液,出现黄色沉淀 | 溶解性: |
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