种类 | 试验种子数 | 发芽种子数 | 发芽率 |
小麦 | 200 | 192 | |
稻谷 | 300 | 282 | |
黄豆 | 150 | 147 | |
绿豆 | 120 | 117 |
(1)说一说发芽率是什么意思?
(2)在表中填出种子的发芽率。
(3)在表中( )种子的发芽率最高,( )种子的发芽率最低。
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