(1)棉花是被子植物,小科利用以下二歧分类检索表对新疆棉花进行分类,它对应检索表中字母
(2)新疆棉的棉纱纤维长度比普通棉的长,这一性状是由
植物检索表 1a有种………………………………2 1b无种………………………………3 2a有花………………………………P 2b无花………………………………Q 3a有根………………………………R 3b无根………………………………S |
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