学进去-教育应平等而普惠
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难度系数:0.65
所属科目:小学英语
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(      ) 1.A. What time is it?                    B. What's the time?                    C. What time is it, now?
(      ) 2.A. It's time for dinner.               B. It's time to go home.               C. It's time to get up.
(      ) 3.A. It's 5:20.                         B. It's 5:30.                                  C. It's 5:40.
(      ) 4.A. Good evening.                      B. Good morning.                     C. Good night.
(      ) 5.A. Eat some rice.                      B. Have some chicken.            C. Have some rice.
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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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