学进去-教育应平等而普惠
试题
类型:听音,选择听到的内容
难度系数:0.65
所属科目:小学英语
选出你所听到的句子。
(     ) 1. A. It has got four legs.                 B. Has it got four legs?            C. It has got a long nose.
(     ) 2. A. It's a very big animal.             B. It is black and white.          C. It's smaller than a sheep.
(     ) 3. A. It lives on a farm.                  B. It lives in the Arctic.            C. It lives in Africa and Asia.
(     ) 4. A. The water in many rivers is dirty.                    B. The panda lives in China.
C. The South China Tiger lived in many parts of China.
(     ) 5. A. Let's join in to help them.                              B. Let's help to save China's tigers!
C. Let's find out about kingfishers on the web.
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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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