(1)心脏是血液循环动力器官,它的壁主要由
(2)血液由④出发,回到①的循环途径叫
(3)观察心脏结构时发现,在心房与心室之间,心室与动脉之间都有能防止血液倒流的
(4)肺是气体交换的场所。血管⑤内的
(5)图中⑦和⑧相比,⑦的管壁
(6)小肠吸收的营养物质通过血液中的
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