(1)甲胺(CH3NH2)是一种弱碱,可与盐酸反应生成盐酸盐(用CH3NH3Cl表示)。下列叙述正确的是___________。
A.CH3NH3Cl在水中的电离方程式为:CH3NH3ClCH3NH+Cl- |
B.0.01 mol/L CH3NH2水溶液的 pH=12 |
C.0.1 mol/L CH3NH2水溶液加水稀释,pH降低 |
D.CH3NH3Cl水溶液中:c(Cl-)>c(H+)>c(CH3NH)>c(OH-) |
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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