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。
(     ) 1. A. There are pretty flowers.        B. It’s in August.          C. I like autumn best.
(     ) 2. A. Spring.                              B. Because I can go swimming.        C. Cool!
(     ) 3. A. It’s rainy and cold.   B. I’m looking at an elephant.     C. I’ll write her a letter.
(     ) 4. A. It’s on September 10th.          B. It’s on June 1st.          C. It’s on April 1st.
(     ) 5. A. It’s Tom’s.                  B. They’re John’s.        C. It’s her dog.
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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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