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(There will be a class meeting about the celebrations of the 100th anniversary of the founding of the CPC. Li Hong and Wang Lin are asked to make a report about their favorite scientists in China. Now they are talking in class )
Li Hong: Hi, Wang Lin, 1．?
Wang Lin: Yuan Longping.
Li Hong: 2．?
Wang Lin: Because he helped to feed nearly one-fifth of the world’s population with less than 9 percent of the world’s total land. He was honored as “The Father of Hybrid Rice.”
Li Hong: 3．?
Wang Lin: Of course. Though he made great contributions to help feed the world, he lived a simple life.
Li Hong: What a great scientist! We Chinese people are really proud of him.
Wang Lin: 4．. Unfortunately, we know he passed away on May 22nd, 2021.
Li Hong: 5．! I think we can learn a lot from him.
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
