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:0.85
所属科目:小学英语
听对话和问句,选出相应的答句,将答案编号写在题前的括号内。
(     ) 1. A. At 11:45.                      B. At 12:15.                 C. At 12:45.
(     ) 2. A. She has a toothache.       B. She has a fever.        C. She has a headache.
(     ) 3. A. Mid-Autumn Festival.     B. Spring Festival.        C. Dragon Boat Festival.
(     ) 4. A. Yes, she did.                 B. No, she didn’t.          C. No, he didn’t.
(     ) 5. A. It’s Tom.                      B. It’s Jack.                 C. It’s David’s brother.
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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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