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学进去-教育应平等而普惠
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难度系数:0.85
所属科目:小学英语
听音选词,补全句子。
( ) 1. Summer is ______.
A. her                                    B. there                          C. here
( ) 2. My birthday is ______ February 1st.
A. on                               B. in                                 C.at
( ) 3. I live in ______.
A. USA                              B. the USA                      C. Chinese
( ) 4. ______ calling?
A. Whose                              B. Who’s                            C. Who
( ) 5. ______ is the skirt?
A. How much                               B. How old                      C. How many
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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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