1.①、②、③、④、⑤的含义符合该循环系统的是
A.种苗培育、饲料加工、排放、废弃物、饲料 |
B.水窖集雨、饲料加工、供暖、废弃物、肥料 |
C.种苗培育、水窖集雨、净化、废气、饲料 |
D.水窖集雨、饲料加工、供暖、肥料、废弃物 |
A.小农经营 | B.集约化程度低 | C.商品率高 | D.科技水平低 |
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