学进去-教育应平等而普惠
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类型:听音,选择正确答案
难度系数:0.65
所属科目:小学英语
听录音,选择合适的答语。录音内容读两遍。
(      ) 1. A. Good morning!        B. Good afternoon!        C. Good evening!
(      ) 2. A. Great.        B. Thanks.        C. Nice to meet you.
(      ) 3. A. Very well.        B. Goodbye.       C. My name is Chen Jie.
(      ) 4. A. Bye.        B. I’m fine, thank you.        C. Yes!
(      ) 5. A. Me too!       B. Bye.        C. My name is Zoom.
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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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