学进去-教育应平等而普惠
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难度系数:0.65
所属科目:小学英语
请根据你所听到的问句,选择正确的答语。
(     ) 1. A They often read books.        B. I am reading books.        C. They are reading books.
(     ) 2. A. Yes, she is.                                B. No, he isn’t.                         C. Yes, she does.
(     ) 3. A. It’s blue.                                B. It’s John’s.                      C. They are Lily’s.
(     ) 4. A. It’s on December 25th.          B. It’s on October 1st            C. It’s in September.
(     ) 5. A. I like summer best.                 B. I can swim in summer.            C. It’s sunny in summer.
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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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