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:0.85
所属科目:小学英语
听录音,根据所听对话及问题,选择正确的答案。(听两遍)
(      ) 1. A. It is tidy.             B. It is messy.             C. It is clean.
(      ) 2. A. He goes to bed late.        B. He doesn't have breakfast.
C. He is always late for school.
(      ) 3. A. No, there isn't.             B. Yes, they are.             C. Yes, there are.
(      ) 4. A. She knew him three years ago.        B. She knew him two years ago.
C. Yes, she knew him well.
(      ) 5. A. He helps his teachers at school.        B. He listens to his teachers at school.
C. He helps his parents do some housework at home.
(      ) 6. A. No, he has many good habits.        B. Yes, he has some bad habits.        C. We don't know.
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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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