“笑”大夫过生日,捧腹大笑、嬉皮笑脸、强颜欢笑、莞尔一笑、破涕为笑、笑逐颜开等子孙们都来贺寿。走在最前面是笑得美丽动人的_______,紧接着是一点儿都不严肃的_______,后面跟着笑得前仰后合的________和刚才还泪眼汪汪的________。那热闹的场面,乐得“笑”大夫合不拢嘴。
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