A.天然水经过自然沉降、过滤、吸附,即可得到纯水 |
B.将氢氧化钠固体溶于水,所得溶液的温度会明显升高 |
C.利用洗涤剂的乳化作用,可轻松去除衣物或餐具上的油污 |
D.若配制 200g 49%的硫酸溶液,可向 100g 水中慢慢加入 100g 98%的浓硫酸 |
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