①小悦:到科技馆当志愿者,一天下来,虽然累但很有成就感
②小华:回老家跟爷爷到菜园里除草、采摘蔬菜,体会劳动的乐趣
③小明:和同学在网吧通宵玩游戏,感觉周末的生活真是惬意
④小刚:观看影片《长津湖》时,一种民族自豪感油然而生
A.①②③④ | B.①②④ | C.①③④ | D.②③④ |
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