搜索
Chen Jie: Hi, John!
John: 2．
Chen Jie: No, she is my friend, Amy.
John: 3．
Chen Jie: Guess!
John: Balls?
Chen Jie: Yes.
John: 4．
Chen Jie: Let’s count! One , two , three, four... nine!
John: 5．
| A．How many? |
| B．Hello, Chen Jie! |
| C．What’s in her box? |
| D．Is she your sister? |
| E．Nine balls. |
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
