When we send a letter or a postcard, we have to put stamps on the envelope (信封) or on the card. When did people first begin to use stamps? Who was the first to think of this idea? Here is some information (信息) about it.
In the early nineteenth century (19世纪), people did not use stamps. They had to pay (付款) for the letters or postcards they received (收到). People didn't like it. First, it was not convenient (方便). Second, sometimes they had to pay for the letters they didn't want to receive at all, such as advertisements (广告). Third, the postage (邮资) was high at that time. And it was difficult for postmen to collect the postage.
Then one person thought out an idea to solve this problem. He was Rolland Hill, a schoolmaster (校长) in England. He was the first to put forward a proposal (建议) to use stamps in 1850s. He thought it would be much more convenient for people. They could go to a nearby post office to buy stamps and put them on the envelopes before they sent letters. The post office could simply put seals (密封) on the stamps to prevent (预防) them from being used again. That was a good idea and it was accepted (接受) by government finally.
1.They sent a letter or a postcard with stamps before early nineteen century.2.They pay for the letters after they received the letter.
3.The postage was expensive at that time.
4.The first person who solve the problem is American.
5.Now they can put the stamps on the envelopes before they sent letters.
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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