A.家中燃气泄漏,立即开灯检查 |
B.稀释浓硫酸时,将水沿烧杯壁缓缓注入盛有浓硫酸的烧杯中 |
C.不慎碰倒酒精灯,洒出的酒精在桌上燃烧,立即用水浇灭 |
D.逃离火灾现场时,可用湿毛巾捂住口鼻,并尽量贴近地面 |
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