实验次数 | 1 | 2 | 3 | 4 | 5 | 6 |
入射角i | 15° | 30° | 45° | 60° | 70° | 80° |
反射角r | 15° | 30° | 45° | 60° | 70° | 80° |
在远洋轮船的船舷上,都漆着五条“吃水线”,又称“载重线”如图所示,其中标有W的是北大西洋载重线,标有S的是印度洋载重线,当船从北大西洋驶向印度洋时,轮船受到的浮力以及北大西洋与印度洋的海水密度ρ1和ρ2的关系正确的是( )
如图,已知点A(0,1),B(0,﹣1),以点A为圆心,AB为半径作圆,交x轴的正半轴于点C,则∠BAC等于 度.
Washing the Apples
Mrs. Smith has a shop in the town. There are all kinds of fruit in her shop. She's friendly to the customers and never fools① anyone. So the customers like to buy fruit in her shop, and she gets more and more money.
One day, the apples she sold were all fresh and nice. She remembered her son Steve liked them best, so she brought some home for her son. After lunch, she went out and left the apples on the table. That afternoon Steve came back from school, he felt very hungry. He looked for something to eat and found some apples on the table. "Great! They are my favorite. " he cried and ate a lot. Mrs. Smith got home after she closed her fruit shop. When she saw Steve, she asked him, "Did you have the apples?" Her son answered, "Yes. And I ate lots of them. " "Did you wash them?" Oh, I forgot. I was too hungry②. What should I do? "
A few minutes later, Mrs. Smith found her son kept on drinking water.
"Are you thirsty? Why are you drinking so much water?" asked the mother.
"No, Mom." answered the boy, "I want to wash the apples in my stomach with the water."