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
听录音, 根据所听短文, 选择正确的答案。
(     ) 1. What did the princess have?
A. A frog.                      B. A golden ball.                  C. A prince.
(     ) 2. Why was the princess sad?
A. Because she was hungry.          B. Because she was too tired.     C. Because her ball rolled into the river.
(     ) 3. How did the princess get her ball back?
A. She jumped into the river.             B. A frog helped her.               C. A prince helped her.
(     ) 4. Where did the princess play with the ball?
A. In the river.                                 B. On the river.                      C. By the river.
(     ) 5. What did the frog turn into?
A. A prince.                                     B. A princess.                         C. A girl.
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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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