组别 | 二氧化碳浓度 | 温度 |
甲组 | 390 μL/L | 20°C |
乙组 | 700 μL/L | 20°C |
丙组 | 390 μL/L | 24°C |
丁组 | 700 μL/L | 24°C |
(1)每组选用3瓶龙须菜,而不是1瓶,目的是
(2)甲组和乙组形成对照实验,可探究
(3)实验结果表明,龙须菜更适合在
(4)龙须菜通过
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