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Water, Ice and Vapour (蒸汽)
Water, ice and vapour look and feel different, but they are the same thing. Ice can change to water, and water can change to ice. Vapour can change to water, and water can change to vapour. When you boil (煮沸) water, it changes to vapour. If you get the vapour and cool it down, it changes back to water. When you put water in the fridge (冰箱), it changes to ice. If you take the ice out of the fridge, it changes back to water in normal (正常的) temperature (温度).
1．Water, ice and vapour are the same thing, but they look different.2．Water can change to ice, but it can’t change to vapour.
3．When vapour cools down, it changes to water.
4．Water can change to ice in the fridge because the temperature is low (低的).
5．Ice can change to vapour in room temperature.
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
