A.心房与心室之间的瓣膜,有利于血液从心室倒流进心房 |
B.小肠皱襞表面有许多小肠绒毛,可扩大表面积,有利于营养物质吸收 |
C.神经元上有许多突起,与其它神经元相接触,有利于信息传递和处理 |
D.肺泡壁及其包绕的毛细血管壁都仅由一层上皮细胞构成,有利于气体交换 |
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