(1)去工厂的途中,同学们看见路边鱼塘中用水泵把水喷向空中,这样做的目的是
(2)在工厂里,同学们看到车间里备有干粉灭火器,灭火时干粉灭火器喷出的固体粉末能覆盖在可燃物表面,此过程中体现的灭火原理是
(3)同学们取锅炉用水的水样,滴加肥皂水,搅拌,观察到产生大量泡沫,验证了锅炉用水是
(4)工厂设有可回收和不可回收垃圾箱,小明自觉响应垃圾分类回收的倡导,将饮用完的金属易拉罐投放到
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