Ma Li is a dessert shop owner in Yinchuan. On a cool morning, she received an online order but it took an hour for her
When the deliveryman came, Ma was a little angry, “I
At that moment, Ma noticed the deliveryman
After the deliveryman left, Ma shared what happened just now on her WeChat Moments(微信朋友圈)with two photos of the deliveryman. Heartwarming comments (评论) poured in, such as “Life is not easy but none of us
The next day, Ma got in touch with the deliveryman and invited him to her shop. Ma expressed people’s kindness to him and said, “I also
Ma received more than 600 yuan in donations from her friends and customers. She said, “I

同类型试题

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


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

