听录音，选出你所听到的单词或短语。( ) 1. A. red

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类型：听音，选择听到的内容

难度系数：0.85

所属科目：小学英语

听录音，选出你所听到的单词或短语。
(     ) 1. A. red                      B. bed                    C. desk
(     ) 2. A. Sam                      B. under                 C. again
(     ) 3. A. umbrella                 B. difficult            C. afternoon
(     ) 4. A. have lunch             B. have fun             C. have a look
(     ) 5. A. in the park             B. in the tree            C. on the tree
(     ) 6. A. in the bag               B. in the box            C. in the basket
(     ) 7. A. on the lake             B. in the park            C. near the hill
(     ) 8. A. so fun                      B. so easy             C. easy and fun

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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

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2019-09-19

用户名称

2019-09-19

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