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
听录音,选出正确的答案。
(      ) 1. Here is a letter from ______.
A. Linda                            B. Mary                       C. Amy
(      ) 2. Mary often gets up at ______ a.m.
A. 6:00                            B. 6:30                            C. 7:00
(      ) 3. Mary eats breakfast ______.
A. at home                       B. at school                       C. in the park
(      ) 4. Mary ______ goes for a walk with her grandparents after school.
A. usually                       B. always                       C. sometimes
(      ) 5. Mary always ______ and reads books in the evening.
A. draws pictures                  B. plays music                  C. does homework
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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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