A.“多好啊!”他在自言自语。突然,他凑到我的耳朵边轻轻地问,“记者,你见过电灯吗?” |
B.清明节前的一个晚上,我又漫步在广场上,忽然背后传来一声赞叹:“多好啊!” |
C.“听说一按电钮,那玩意儿就亮了,很亮很亮……”他又划着一根火柴,点燃了烟,又望了一眼图画,深情地说,“赶明儿胜利了,咱们也能用上电灯,让孩子们都在那样亮的灯光底下学习,该多好啊!” |
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