听短文，判断正 (T) 误 (F)。( ) 1. There were many st

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类型：听音判断

难度系数：0.65

所属科目：小学英语

听短文，判断正 (T) 误 (F)。
(       ) 1. There were many stars in the sky ten years ago.
(       ) 2. People worked in the factory ten years ago.
(       ) 3. There was a clean river ten years ago.
(       ) 4. I often swim in the river now.
(       ) 5. The sky is blue now.

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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

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2019-09-19

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