学进去-教育应平等而普惠
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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's Thursday. B. It's Friday. C. It's Saturday.
_____) 2. A. He's cleaning the car. B. He's cleaning the door.     C. He's cleaning the desk.
_____) 3. A. He's washing the dishes.     B. He's cleaning the car.     C. He's watching TV.
_____) 4. A. He's in the living room.     B. He's watching TV.     C. He's sweeping the floor.
_____) 5. A. He's cooking.     B. He's making the bed.     C. He's making a kite.
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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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