学进去-教育应平等而普惠
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难度系数:0.40
所属科目:小学英语
听录音,根据所听短文,选出正确的答案。
(     ) 1. How old is Ben?
A. He's ten.             B. He's eleven.             C. He's twelve.
(     ) 2. How many subjects does Ben have at school?
A. Six.                  B. Seven.                    C. Eight.
(     ) 3. What day is it today?
A. It's Friday.             B. It's Saturday.             C. It's Sunday.
(     ) 4. What subjects does Ben like?
A. He likes Chinese and Maths.     B. He likes English and Music.     C. He likes English and Art.
(     ) 5. What can Ben do on Saturday?
A. He can go to school.     B. He can have a swimming lesson.     C. He can play basketball with his friends.
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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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