学进去-教育应平等而普惠
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类型:听音,选择正确答案
难度系数:0.65
所属科目:小学英语
听短文,选择正确的选项。
( ) 1. Where is Mary from?
A. The UK.                                  B. The USA.        C. China.
( ) 2. Mary’s father goes to work ______.
A. by bike                           B. by car                           C. on foot
( ) 3. Mary’s mother is ______.
A. a Chinese teacher       B. an English teacher       C. a maths teacher
( ) 4. Mary’s ______ works in the university.
A. father                           B. mother                           C. sister
( ) 5. There are ______ people in Mary’s family.
A. three                           B. four                                  C. five
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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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