搜索
Yuan Longping was born in Beijing in 1930. He moved with his family and went to school in many places because of wars(战争). Yuan Longping was famous for developing the first hybrid rice(因研究杂交水稻而出名) in 1970s. People call him “The Father of Hybrid Rice. He was great.
| A．In 1930. | B．In 1953. | C．In 1970s. |
| A．Beijing. | B．Shanghai. | C．Guangzhou. |
| A．his parents’ job | B．his job | C．wars |
| A．The Father of Hybrid Rice | B．The Father of Food | C．The Father of fruits |
| A．Time. | B．Yuan Longping. | C．Food. |
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
