(1)白鳍豚的肺容量(liáng liàng)很大,它头顶露(lù lòu)出水面,通过鼻孔(吸 息)足一口气,就能在水中(潜 前)行半小时左右。
(2)旅客乘船在长(cháng zhǎng)江中游旅行,偶尔会看到江面上有个银灰色的(庞 宠)然大物,它或在波涛中翻滚,或以三角形的背鳍(jí qí)劈开浪花飞速前进。

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

