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:0.65
所属科目:小学英语
听问句。选择与听到问题相符的答语,将其标号填入题前括号。
(      ) 1. A. I’m doing my homework.       B. I did my homework.       C. I’m going to do my homework.
(      ) 2. A. She is playing the erhu.       B. He is playing the drum.       C. I’m playing the piano.
(      ) 3. A. Because I like delicious food.       B. Because I like going by bus.       C. Because I like animals.
(      ) 4. A. I am going to the Great Wall.       B. I went to the park.       C. I will go there by taxi.
(      ) 5. A. She will visit my grandparents.
B. She visited my grandparents.
C. She is going there by car.
(      ) 6. A. You will send me a postcard.
B. Yes, I will send you a postcard.
C. Yes, I will write an email to you.
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优质答疑

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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