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| A． A: Mum, it's Teachers'Day. I'd like a card for my teacher. B: OK! Here is a green one on the desk. A: Thank you, mum. What's the time, please? B: It's seven o'clock. A: It's late for school. Where's my schoolbag? B: It's on the bed. A: Mum, let's go. B: OK! Let's close the door. (1). It's Techers' Day. (2). His schoolbag is on the desk. (3). There is a blue card on the bed. (4). They go to school at seven. |
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
