搜索
1．
( )| A．There are ten big lions at the zoo. |
| B．There are five tigers in the park. |
( )| A．I bought some crayons yesterday. |
| B．I bought some pencils yesterday. |
( )| A．They’re having a party. |
| B．They’re having a picnic. |
( )| A．There is a bike under the tree. |
| B．There is a kite under the tree. |
( )| A．He is eating some chocolate. |
| B．He is drinking some milk. |
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
