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
听录音,根据对话内容,回答问题。(听两遍)
(     ) 1. What did Sam buy?
A. He bought some maps.       B. He bought some cups.       C. He bought some caps.
(     ) 2. Is Peter going to play basketball?
A. Yes, he is.       B. No, he isn't.       C. No, he is going to play football.
(     ) 3. Are there any baseball caps in Sam's bag?
A. Yes, there are.       B. Yes, there are three.       C. No, there aren't.
(     ) 4. Is there a cat in the tree?
A. Yes, there is.       B. No, there is a kite.       C. No, there is a bird.
(     ) 5. Why is Frank eating?
A. Because he likes eating.       B. Because it's very nice.       C. Because he's hungry.
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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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