学进去-教育应平等而普惠
试题
类型:听力题
难度系数:0.65
所属科目:小学英语
听录音,根据你所听到的内容,选择正确答语。
(     ) 1. A. That’s a parrot.          B. It’s a parrot.               C. They are parrots.
(     ) 2. A. It’s eight!                  B. They’re eight.            C. I’m eight.
(     ) 3. A. It’s in my bag.          B. He’s in the library.        C. She’s at school.
(     ) 4. A. Yes, it is.                 B. No, it isn’t.                 C. No, he isn’t.
(     ) 5. A. Thank you.               B. I’m sorry.                  C. It’s in the schoolbag.
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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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