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. It's draw

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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. It's drawing pictures.        B. It's taking pictures.               C. It's looking at the pictures.
(      ) 2. A. They're jumping.             B. The horse is jumping.            C. We're singing.
(      ) 3. A. The tiger is running.        B. The tiger is flying a kite.        C. The tiger is dancing.
(      ) 4. A. We want some fish.          B. We want some noodles.        C. We want some rice.
(      ) 5. A. The egg is seven yuan.       B. The flower is eight yuan.       C. The potato is two yuan.

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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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