我们把用剩的肥皂头儿,放在一只小木碗里,加点儿水,和弄和弄,使它溶化。然后用一根细竹管,蘸上那黏稠的肥皂水,慢慢地吹起来,吹成一个又轻又圆的泡儿。再轻轻一提,那轻圆的球儿,便从竹管上落下来,慢悠悠地在空中飘游。
________________________________________________________________________
________________________________________________________________________
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