A. 合上你的书 B. 看黑板 C. 请进 D. 关上门 E. 打开书
F. 一块橡皮 G. 在上课 H. 起立 I. 坐下 J. 下午好
1.stand up (
2.close the door (
3.open the book (
4.Good afternoon (
5.look at the blackboard (
6.in class (
7.sit down (
8.close your book (
9.come in (
10.a rubber (

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

