A.可燃性气体大量泄漏时,立即接通电源用排气扇排气 |
B.酒精灯中的酒精洒在桌上燃烧起来,立即用湿抹布扑盖 |
C.氢氧化钠溶液沾到皮肤上,直接涂上浓盐酸 |
D.少量浓硫酸沾到皮肤上,用大量水冲洗,然后涂上浓氢氧化钠溶液 |
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