学进去-教育应平等而普惠
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类型:听音,选择听到的内容
难度系数:0.85
所属科目:小学英语
听录音,选择所听到的单词或短语,并将其正确答案的标号填入题前括号内。每个小题读两遍。
(      ) 1. A. knock             B. ask                    C. back
(      ) 2. A. else             B. island                    C. forest
(      ) 3. A. wrong             B. worry                    C. would
(      ) 4. A. see films       B. next time             C. have a match
(      ) 5. A. a cup of       B. by the way             C. say goodbye to
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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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