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. Last summer holiday,Mickey went to a ________.
A. city                           B. village                           C. park
(     ) 2. Mickey went there with his ________.
A. parents                      B. friends                  C. grandparents
(     ) 3. The air was ________ there.
A. fresh                         B. clean                      C. bad
(     ) 4. There were lots of ________ in the river.
A. a clown                      B. a cloud                    C. fish
(     ) 5. In the ________, he could see so many stars in the sky.
A. evening                    B. afternoon               C. winter holiday
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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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