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学进去-教育应平等而普惠
试题
类型:选择题
难度系数:0.65
所属科目:小学英语
选出下列句子的正确答语。
1.What is he doing?
A.He is a teacher.
B.He is handsome.
C.He is telling a story.
2.What are they doing?
A.Yang Ming is watching them.
B.Mary is watching them.
C.Yang Ming and Mary are watching them.
3.What are you doing?
A.You are singing.
B.I am singing.
C.He is singing.
4.She’s singing a very famous song.
A.Wow! What a beautiful song!
B.I don’t know.
C.I’m sorry.
5.What is he wearing?
A.I am wearing a hat.
B.He is wearing a hat.
C.He want to wear a hat.
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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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