The next morning Bobbie gets up very early. Phyllis is still sleeping. Bobbie pulls her hair (not very h
“What’s the matter?” asks Phyllis in a very sleepy voice.
“Wake up! We’re in our n
It’s cold in the kitchen. The children find some plates and cups in a box and p
The house is in a field on the top of a hill (山顶). There are m
“Let’s go d
“We can see the trains f
When Mother comes out to look for them at eight o’clock, they are a
“Wake up, children!” she says. “Breakfast is r
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