A.2,4-D可杀除禾谷类田间双子叶杂草是由于双子叶植物对2,4-D的敏感性强 |
B.双子叶植物花、叶和果实的脱落过程中存在生长素与乙烯的对抗作用 |
C.赤霉素能促进果柄伸长,使无籽葡萄的果实增大 |
D.喷洒脱落酸可延长绿色叶菜类蔬菜的保鲜时间 |
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