听录音，根据所听句子选出相应的答句。(听两遍) ( ) 1. A. He's my unc

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听录音，根据所听句子选出相应的答句。(听两遍)
(      ) 1. A. He's my uncle.                           B. She's my aunt.
(      ) 2. A. He's in the library.                      B. He's Liu Tao.
(      ) 3. A. Yes, he's my brother.                  B. Yes, she is.
(      ) 4. A. This is my mother.                      B. Nice to meet you.
(      ) 5. A. Thank you.                              B. Yes, we are.

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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

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2019-09-19

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