方法是把用剩下的碎肥皂放在一只小木碗里,加上点儿水,和弄和弄,使它融化,然后用一支竹笔套管,蘸上那黏稠的肥皂水,慢慢地吹起,吹成一个轻圆的网球大小的泡儿,再轻轻地一提,那轻圆的球儿便从管上落了下来,软悠悠地在空中飘游。
“放”“加”“和弄和弄”写出了制作的经过
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