A.河水的净化和粗盐的提纯都要进行过滤、吸附和消毒 |
B.浓硫酸和浓盐酸露置在空气中一段时间,两种溶液质量都会增大 |
C.碳铵与草木灰(含K2CO3)混用,可供给作物更多的营养元素并增强肥效 |
D.生石灰常用作干燥剂,熟石灰可配制农药波尔多液 |
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