问题
填空题
潜水艇在水面下下潜的过程中，受到的浮力______，水对它的压强______．（均选填“变大”、“变小”或“不变”）
答案
潜水艇在下潜的过程中：
∵F浮=ρ水gv排，排开水的体积v排不变，
∴潜水员受到的浮力不变；
∵p=ρgh，所处深度h变大，
∴潜水员受到水的压强变大．
故答案为：不变，变大
搜题请搜索小程序“爱下问搜题”
潜水艇在水面下下潜的过程中，受到的浮力______，水对它的压强______．（均选填“变大”、“变小”或“不变”）
潜水艇在下潜的过程中：
∵F浮=ρ水gv排，排开水的体积v排不变，
∴潜水员受到的浮力不变；
∵p=ρgh，所处深度h变大，
∴潜水员受到水的压强变大．
故答案为：不变，变大
How do people pass on messages? When you write a letter or make a telephone call, your words _ 1___ a message. People communicate with words. Do you think you can communicate _2__ words? A smile __3_ your face shows you are happy and friendly. Tears in your eyes tell__4__ that you are sad. When you __5_ your hand in class, the teacher knows you want to say something __6___ ask questions. You shake your head, and people know you are saying no. You nod and people know you are saying ____ .7 Other things can also give some information. For example, a sign at the bus stop helps you to know which bus __8___. A sign on the wall of your school helps you to find the library. Signs on doors tell you __ 9___ to go in or out. __10___ you ever noticed that there are a lot of signs around you and that you receive messages __11__ them all the time? People can communicate __12___ many other ways. A (An) 13__ can use his drawings to tell about beautiful mountains, about the blue sea and many other things. Books __14___ to tell you about all wonderful things in the world and also about people and their ideas. Books, magazines, TV and radio and films all help us to communicate with other people. They all help us to know __15__ is going on in the world.
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