预习课文时,乐乐读到“这些石钟乳和石笋,形状变化多端,再加上颜色各异,即使不比作什么,也很值得观赏”时,不认识“端”字,准备使用部首查字法查字典,先查______部,再查______画,翻开这个字所在页,知道了读音是______。请帮她选择“端”在这句话中的意思(填序号)________。①端正,不歪斜②项目,方面③仔细地看
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