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In China, learning some safety knowledge is becoming more and more important now. How should you keep yourself safe?
At school：
When students around you begin to push, try to hold onto something, or stay in a safer corner.
On your way home or to school：
Wait for the green traffic light.
Stay calm and leave quickly. Use a piece of wet cloth to cover your mouth and nose so that you don't breathe in smoke.
For riding on the escalator（自动扶梯）：
| A．When there's a fire |
| B．Here are some tips for you |
| C．It is dangerous to run up and down on the escalator |
| D．If you see a car coming, don't cross until it really stops |
| E．If you fall down in a crowded place, cover your head with both hands |
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
