A.鸟的前肢变成翼,有利于在空中飞行 |
B.神经元有许多突起,能增大细胞的表面积,有利于与外界进行气体交换 |
C.蜥蜴的皮肤表面覆盖角质的鳞片,能减少水分的蒸发,适应陆生环境 |
D.肺泡壁和毛细血管壁都由一层扁平的上皮细胞构成,有利于进行气体交换 |
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