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. Wang Lin is from _________.
A. China                  B. New Zealand
(     )2. Wang Lin is a _________.
A. doctor                  B. student
(     )3. Wang Lin is in Grade _________.
A. Four                    B. Five
(     )4. There are _________ boys in Wang Lin’s class.
A. forty                  B. twenty
(     )5. Wang Lin’s father is a _________.
A. manager             B. doctor
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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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