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There are some public signs in the library. They mean different things. The sign on the wall means “No eating or drinking”. We shouldn't eat or drink in the library. Look! There is a sign on the door. It means “Be quiet”. We shouldn't make noise here. The sign “No smoking” means we shouldn't smoke here. The sign “Keep the books clean” means we shouldn't write or draw on the books.
1．There are some public signs in the library.2．We can eat some bread in the library.
3．We can talk loudly in the library.
4．“No smoking” means we shouldn't smoke here.
5．We can draw pictures on the books 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
