学进去-教育应平等而普惠
试题
类型:判断题
难度系数:0.65
所属科目:小学英语
请判断这样做是否安全,安全的打“√”,不安全的打“×”。
_____)1.Play football on the street.
_____)2.Stand too close to the street.
_____)3.Run to the bus and jump on.
_____)4.Wear the seat belt in the car.
_____)5.Play with the fire.
_____)6.Look to the left and to the right before you cross the street.
_____)7.Play on the icy(结冰的)river.
_____)8.Talk with the bus driver.
_____)9.Take your mother's hand when you cross the street.
_____)10.Touch the electric wire(电线).
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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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