学进去-教育应平等而普惠
试题
类型:听音,选择正确答案
难度系数:0.65
所属科目:小学英语
听小对话,选择正确的选项。
(     ) 1. —Who is she?   —She is my ______.
A. mother                B. teacher               C. sister
(     ) 2. —Where is the ruler?   —It’s ______ the notebook.
A. on                         B. under                   C. near
(     ) 3. Is the new friend a boy or girl?
A. A girl.                    B. A boy.              C. No, he isn’t.
(     ) 4. —What colour are the desks?   —They are ______.
A. pink                    B. blue                    C. brown
(     ) 5. —How many kites do you see?   —I see ______.
A. seventeen          B. eighteen              C. nineteen
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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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