类别 物质 化合价 | 单质 | 氧化物 | 酸 | X |
0 | a | — | — | — |
+4 | — | b | d | Na2SO3等 |
+6 | — | c | e | F |
A.X表示碱 |
B.物质a在空气中燃烧会发出明亮的蓝紫色火焰 |
C.物质b是二氧化硫,它是空气污染物之一 |
D.物质d和NaOH溶液发生中和反应生成Na2SO4和H2O |
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