实验条件 | 水分消耗 | Ca2+ | K+ | Mg2+ | NO3− | PO43− | SO42− |
光照 | 1090 mL | 135 | 27 | 175 | 104 | 3 | 187 |
黑暗 | 435 mL | 105 | 35 | 113 | 77 | 54 | 115 |
(2)光照条件下,根系吸收离子所需的能源物质是由
(3)与土壤栽培相比,营养液循环的液体栽培系统具有的优点是
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