(1)红葡萄酒在储存过程中会生成一种有香味的酯,该转化属于
(2)大豆、牛奶、瘦肉等食物为人体提供的主要营养素是
(3)人体缺硒可能引起癌症,硒元素对人体而言属于
(4)日常生活中,人们常利用洗涤剂对油污的
(5)电解水时为增强导电性可加入少量NaOH,已知NaOH不参与反应,则电解后溶液的PH
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