A.强酸、强碱、重金属盐等可使蛋白质变性 |
B.用新制氢氧化铜悬浊液(必要时可加热)能鉴别甲酸、乙醇、乙醛 |
C.乙酸乙酯中混有的乙酸,可加入足量的饱和溶液,经分液除去 |
D.向苯和苯酚的混合液中加入浓溴水,充分反应后过滤,可除去苯中少量的苯酚 |
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