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1.讲座内容及目的：火灾的危险；防止火灾的建议……；
2.讲座具体时间及地点：本周日下午两点到四点，学校报告厅；
3.讲座要求（全体学生务必参加，自带纸笔记录等）。
注意: 1.词数80左右；2.可以适当增加细节，以使行文连贯
This is a notice from the Student Union to inform you about the upcoming lecture on fire prevention.
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We are looking forward to your punctual participation.
The Student Union
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
