学进去-教育应平等而普惠
试题
类型:选择题
难度系数:0.64
所属科目:小学英语
听录音,选择正确的应答。(听两遍)
_____) 1.A. She went to Beijing.               
B. She ran in the playground.  
C. She picked oranges.
_____) 2.A. They’re from my friends.           
B. They are for my friends.     
C. They are my friends.
_____) 3.A. Yes, they were.       
B. Yes, we were.       
C. Yes, there were.
_____) 4.A. I play football.       
B. I watered flowers.    
C. I’m swimming.
_____) 5.A. I’m tired.            
B. By bus.            
C. I’m fine.
_____) 6.A. Yes, I can.            
B.I can.              
C. No, I can’t.
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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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