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. A. In the morning.       B. It's six thirty.       C. At nine o'clock.
(       ) 2. A. He's Mike.          B. It's Mike's.                            C. I usually get up at 8: 00 o'clock.
(       ) 3. A. It's February.       B. Summer is hot.       C. It's spring.
(       ) 4. A. Because I can skate.   B. Because I can fly kites.            C. Because it's sunny and warm.
(       ) 5. A. Yes, she is.       B. No, she haven't.       C. No, she doesn't.
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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

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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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