Jia Sixie, author of China's first agricultural encyclopedia, was one of the leading agronomists (农学家) in Chinese history. In the late years of the Northern Wei Dynasty, he wrote Qimin Yaoshu, the
Jia Sixie was born in Yidu County in Shandong Province. During his childhood, Jia's family wasn't wealthy, but had
The book, which has 92 chapters in 10 volumes and nearly 120,000 characters,
Qimin Yaoshu was first distributed mainly among common people. In the late Tang Dynasty, the book was introduced to Japan. So far, the book

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

