【部首】广
【结构】半包围
【文字源流】形声字。广表意,篆书之形像房屋;發(发fa)表声,发有发射义,发射之矢必离弦而去,房屋倒塌,梁、柱、屋顶也必离其位而倒下。声旁简化。本义是房屋倒塌。引申为无用。
【常用词组】废物、废人、废书而叹
【课文原句】老汉吼道:“少废话,快走。”
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