丁大爷今年80多岁了,他经常穿一件蓝棉袄和一顶灰色棉帽,保持着坚苦朴素的作风。在解放战争中,他推着小车为前方送小米、玉米、面粉等粮食,不知走过了多少路?曾四次被评为“支前模范”的光荣称号。如今,他是我校校外辅导员,经常教育我们:“我经历了两个新旧社会,深知幸福生活来之不易。你们可要珍惜它呀!”
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