听录音，选择你所听到的句子，将其序号填入题前括号里。( ) 1. A. Sam is goi

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听录音，选择你所听到的句子，将其序号填入题前括号里。
(     ) 1. A. Sam is going to fly a kite.   B. Sam is going to ride a horse.   C. Sam is going to read a book.
(     ) 2. A. It's going to fish.   B. I want some fish.   C. You can have some fish.
(     ) 3. A. There is a horse in the photo.   B. There is a sheep in this photo.   C. There is a pig in the photo.
(     ) 4. A. We're going by plane.   B. We're going to visit Hainan by plane.   C. We're going by car.

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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

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2019-09-19

用户名称

2019-09-19

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