A.碱液不慎溅到手上,先用大量水冲洗,再用饱和硼酸溶液洗,最后用水冲洗 |
B.和的混合物经溶解、过滤,洗涤、干燥,可分离出 |
C.用容量瓶配制溶液,定容时若加水超过刻度线,立即用滴管吸出多余液体 |
D.火柴头的浸泡液中滴加溶液,稀和溶液,可检验火柴头是否含有氯元素 |
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