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Invention Competition is back AGAIN Got an idea to change the world? The most popular competition is coming again this year! Time: October 26th, 2022—December 20th, 2022 Prize: 3000 yuan for No. 1, 2000 yuan for No. 2, 1000 yuan for No. 3 Many great inventions start with a small idea. Have you ever thought about making your life more convenient or interesting? Here is a chance for you! The materials you send to us should include: ①Your name and school ②The name and introduction of the invention ③A 2-minute video including a photo of your invention and the process of developing it. Warning: Make sure the invention is designed and made by you. Email address: yaliinvention@163.com |
1．If you win the first prize, you will get _________ as a reward.
| A．3000 yuan | B．2000 yuan | C．1000 yuan |
| A．by calling | B．by writing emails | C．by visiting the website |
| A．Your invention has to be useful. |
| B．You can send materials to the host on November 2nd. |
| C．You just need to send a photo and the introduction to the host. |
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
