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Old Peter likes reading very much because he wants to know everything. There are many books in his study. Some old books about China are in Chinese. Old Peter can't understand the words in the books. But he thinks he can understand the pictures in them. In fact, Chinese pictures are not easy to understand. For example, in Qi Baishi's pictures, you can't see water, but you can see fish swimming. How can fish swim without water? Old Peter thinks maybe he could see the water if he has got some glasses from China. Can he?
1．Old Peter2．Old Peter
3．Old Peter
4．
5．The Chinese books in his study
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
