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:0.85
所属科目:小学英语
Listen and choose.听句子,选出你所听到的单词或词组,每题读两遍。
(      )1. A. businessman            B. fisherman                      C. police officer
(      )2. A. actor                      B. taxi driver               C. artist
(      )3. A. pilot                       B. scientist                      C. head teacher
(      )4. A. coach                      B. factory worker          C. postman
(      )5. A. teacher                    B. teach                      C. teaching
(      )6. A. work                       B. worker                    C. working
(      )7. A. gave                       B. gym                      C. coach
(      )8. A. crossing                  B. comic                      C. cleaner
(      )9. A. sea                         B. type                       C. lake
(      )10. A. reporter                 B. factory                      C. police
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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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