学进去-教育应平等而普惠
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难度系数:0.85
所属科目:小学英语
听录音,选出合适的答语,录音内容读两遍。
(      ) 1. A. Yes, please. I need a sweater.        B. Sure. Here you are.       C. Yes, I can.
(      ) 2. A. They're seventy yuan.               B. I want a shirt.                C. It's seventeen yuan.
(      ) 3. A. It's cool.                                  B. Sure. Here you are.        C. It's good.
(      ) 4. A. No, it isn't.                            B. Yes, it's short.              C. No, it's too long.
(      ) 5. A. It's fifty yuan.                            B. They're forty yuan.        C. They're black.
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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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