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The Library Rules
1.You shouldn't talk in the library.
2.You shouldn't eat in the library.
3.You shouldn't listen to music in the library.
4.You shouldn't take an umbrella in the library.
5.You should keep the book clean and return it on time.
6.You shouldn't sing or dance in the library.
( )1.We can eat in the library.
( )2.We can't talk in the library.
( )3.We must return the book on time.
( )4.We should obey(遵守) the library's rules.
( )5.We can sing and dance in the library.
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
