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学进去-教育应平等而普惠
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类型:任务型阅读
难度系数:0.65
所属科目:小学英语

A hot dog is not really a dog. It is a long bread roll with a hot sausage in it. It is Americans’ favourite food. You can buy hot dogs in fast food restaurants everywhere. The hot dog comes from Germany. But why has it got the name “hot dog”? Does it look like a dog? Yes, it looks like a German dog—dachshund (达克斯猎犬).

1.A hot dog is a dog. (         )
2.Americans don’t like hot dogs. (         )
3.You only can buy hot dogs in America. (         )
4.The hot dog comes from Germany. (         )
5.A hot dog looks like a dachshund. (         )
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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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