学进去-教育应平等而普惠
试题
类型:听音,选择正确答案
难度系数:0.65
所属科目:小学英语
听对话,选出所给问题的最佳选项。(听两遍)
(      ) 1. Where are they?
A. In a bookshop.                         B. In a juice shop.                       C. In a toy shop.
(      ) 2. How does Tom usually go to work?
A. By metro.                                B. By car.                                 C. On foot.
(      ) 3. What is Anna going to do tomorrow afternoon?
A. Have a swimming lesson.          B. Fly kites.                                C. Do her homework.
(      ) 4. When does the train start to leave?
A. At 9:00.                                   B. At 8:40.                                C. At 9:20.
(      ) 5. What did Mike do yesterday?
A. He visited his grandpa.               B. He stayed at home.                 C. He bought a mobile phone.
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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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