学进去-教育应平等而普惠
试题
类型:选内容补全对话
难度系数:0.85
所属科目:小学英语
Peter: Look at this great postcard. It's a picture of New York.
Lucy: How many people are there?
Peter: 1. The US is a big country.
Lucy: Wow!
Peter: Tell me more about New York. Where's New York?
Lucy: 2.
Peter: And what about Canada?
Lucy: 3.
Peter: How many stars has American flag got?
Lucy: 4.
Peter: You are so clever.
Lucy: 5.
A.It's in the east of the US.
B.Thank you.
C.Canada is in the north of the US.
D.It has got more than eight million people.
E.Their flag has got fifty stars.
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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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