1.活动目的
2.时间:4月10日(星期日),上午8: 00-11: 00;地点:火车站
3.活动内容:捡垃圾(pick up rubbish)、信息咨询(provide information for passengers)、帮助使用自助售票机(ticket vending machine)等
4.你的感受
注意:1.词数100左右(开头和结尾已给出,但不计入总词数);
2.可以适当增加细节,以使行文连贯.
A voluntary activity
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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

