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
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(     ) 1. Tina and I went to the park ________.
A. yesterday          B. last Sunday          C. last Saturday
(     ) 2. We went to the park ________.
A. by bike            B. by bus             C. on foot
(     ) 3. The boy couldn't ________.
A. ride a bike          B. fly a kite          C. walk
(     ) 4. The boy's mother was ________.
A. happy             B. sad            C. tired
(     ) 5. We couldn't (不能) find our ________. We were sad.
A. toys             B. football             C. skipping rope
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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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