学进去-教育应平等而普惠
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类型:听音,选择正确答案
难度系数:0.65
所属科目:小学英语
听录音,选择相应的答语,将其序号填入题前括号里。
(      ) 1. A. It’s a desk.                           B. Yes, it is.                           C. It’s in the book.
(      ) 2. A. It’s a book.                           B. No, it isn’t.                           C. It’s a desk.
(      ) 3. A. It’s a red ball.                           B. Yes, it is.                           C. No, it’s a red ball.
(      ) 4. A. It’s in the green bag.              B. It’s a red book.                    C. I don’t know.
(      ) 5. A. Nine girls.                           B. I’m fine, thank you.              C. I’m ten.
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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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