A.电解水产生氢气和氧气,证明化学反应中分子、原子都可再分 |
B.金刚石和石墨都是由碳元素组成的单质,说明同种元素可以组成不同种物质 |
C.铁由原子构成,二氧化碳由分子构成,由此可见物质都是由分子和原子构成的 |
D.100mL的酒精和100mL的水混合后体积小于200mL,是由于分子变小的缘故 |
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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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