(1)糖类、脂肪、蛋白质和维生素都是人类的基本营养物质,它们所属的类别是
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(2)桔子、柠檬等水果中含有酸,吃起来越酸的水果其果汁的pH越
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(3)维生素C又名抗坏血酸,在酸性环境下稳定,高温下不稳定。它主要存在于水果和蔬菜中,能增强人体对疾病的抵抗能力。
①根据信息可知,维生素C溶液显
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②在下列物质中,能与维生素C溶液发生反应的是
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a食盐
b苛性钠
c硫酸镁
③为较好吸收利用维生素C,食用黄瓜时宜
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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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