A.肺泡壁和毛细血管壁都是由一层扁平的上皮细胞构成,利于肺泡与血液进行气体交换 |
B.小肠中有多种消化液,利于小肠消化食物 |
C.心房与心室之间、心室与动脉之间、静脉血管中都有瓣膜,可防止血液倒流 |
D.神经元的突起末端与多个神经元的突起相连,便于接受刺激,产生并传递兴奋 |
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