A.进行过滤操作时,液体沿玻璃棒流入过滤器,并使液面高于滤纸边缘 |
B.进行蒸发操作时,待混合物中的水分完全蒸干后,再熄灭酒精灯 |
C.进行蒸馏操作时,将温度计的水银球伸入液面以下 |
D.进行分液操作时,使下层液体从下口放出,上层液体从上口倒出 |
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