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:0.85
所属科目:小学英语
听录音,选择正确的答语。
(     ) 1. A. I like reading stories.              B. I’m writing an email.              C. Why not?
(     ) 2. A. Yes, he is.                                  B. No, she doesn’t.                    C. Yes, he does.
(     ) 3. A. He is from America.              B. He is Mike.                    C. He is eleven years old.
(     ) 4. A. They are talking about their pen pals.        B. They are dancing.          C. They like doing kung fu.
(     ) 5. A. He is from Canada.          B. He likes doing word puzzles.          C. He lives in Canberra.
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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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