学进去-教育应平等而普惠
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难度系数:0.85
所属科目:小学英语
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(      ) 1. My mother is a ______. She’s very friendly.
A. teacher       B. doctor       C. cook
(      ) 2. Would you like some ______?
A. beef       B. chicken       C. fish
(      ) 3. Let me clean the ______.
A. classroom       B. windows       C. teacher’s desk
(      ) 4. Put your ______ in your desk.
A. English book       B. Chinese book       C. maths book
(      ) 5. My father is in the ______.
A. living room       B. bedroom       C. bathroom
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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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