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Yuan Longping, “Father of Hybrid (杂交) Rice”, was born in Beijing. He is a famous 1．. He spent most of his life 2． rice in the fields. In 1974, he and his team 3． in developing a set of technologies for producing hybrid rice. The yields (产量) of the “Super Rice” are 30 percent 4． than those of common rice. By his achievement, China can feed her 1.4 billion (十亿) population. Since 1979, his technologies for hybrid rice have been introduced into many countries around the world. Yuan Longping has helped solve the food problem not only for China but also for the world. We Chinese are 5． proud of him. We’ll remember him forever.
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
