学进去-教育应平等而普惠
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难度系数:0.65
所属科目:小学英语
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Last week we learned a lot from social studies . We learned about some interesting animals . They are called dinosaurs. Dinosaurs were huge animals .They lived millions of years ago .They were tall, big and strong. Some could ran very fast , but some only walked slowly, some could fly. Some dinosaurs ate grass and plants and some ate meat .
(    )(1)We learned about some interesting animals .
(    )(2)We learned a little from social studies .
(    )(3)Dinosaurs lived millions of years ago .
(    )(4)All dinosaurs could run very fast.
(    )(5)Some dinosaurs ate grass and plants and some ate meat.
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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

用户名称
2019-09-19

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

用户名称
2019-09-19
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