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Yuan Longping (1930-2021) is known as the father of hybrid rice (杂交水稻). Seeing people die of hunger when he was young, Yuan decided to find a way to i1． rice production and fill people’s bowls. In 1973, he finally developed the first hybrid rice. Yuan helped China work a great wonder feeding nearly one-fifth of the world’s population with l2． than 9% of the world’s total farmland. He not only made a big difference to the lives of the C3． people, but also many in other countries. To this day, hybrid rice has been grown in over 40 countries.
“I have two d4．. One is to enjoy the cool under the tall rice, and the other is to grow hybrid rice across the world,” Yuan said. And he worked till the e5． of his life to make them come true.
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
