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Zip: Where are you from?
Panda: I’m from China.
Zip: What’s your lucky number?
Panda: Our lucky number is six.
Zip: I’m from Canada. Our lucky number is seven.
Panda: Who’s there?
Zip: Oh! There is Zoom.
Panda: How many gifts do you have?
Zip: I have two gifts.
Pig: I have three gifts.
Duck: I have one gift.
Panda: Me too.
Pig: SURPRISE!
Duck: Happy birthday to you!
Zip: This cake is for you, Zoom.
Zoom: Thank you. Let’s eat the cake!
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
