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A.三种物质的溶解度都随温度升高而增大 |
B..t1℃时 20g 丙加入 50g 水中,充分搅拌得到 70g 溶液 |
C.甲的饱和溶液中混有少量乙,可通过降温结晶获得较纯净的甲 |
D.t2℃时三种物质的饱和溶液降温到t1℃,所得溶液中甲和丙的溶质质量分数相等 |
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同类型试题
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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
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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
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