常用的小物体中，包含着许多物理知识，请你在表中填上物体所应用_爱下问搜题

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问题问答题

常用的小物体中，包含着许多物理知识，请你在表中填上物体所应用的物理知识：

小物体	应用的物理知识
刀、针
剪子

答案

根据我们所学的压强和杠杆的知识作答，答案如下表：

小物体

应用的物理知识

刀、针

刀的刃很薄是通过减小受力面积来增大压强的；

针头很尖是通过减小受力面积来增大压强的；

刀和针都是比较光滑的是通过减小接触面的粗糙程度来减小摩擦的．

剪子

剪子实质就是一对杠杆；

剪子的刃很薄也是通过减小受力面积来增大压强的．

完形填空

I drove to a local supermarket the other day. My shopping list was     and my wallet was light. Still, I needed to get a week’s worth of groceries for my family. I parked my car, looked down at my list, and hoped I could       it all.
As I       the door, I saw a man with kind eyes and a gentle      . He said he was collecting for a local food bank that helped to     the hungry in my area. He handed me a second shopping list of things they could use and asked me to     if I could. I smiled back, took the        and walked into the store. I really wanted to help, but wasn’t sure if I could this time.
I walked through the store, picking up vegetables, soup, spaghetti, bread, milk, cereal, macaroni, bananas, and a dozen other things. I slowly       each item off my list until I was done. When I looked down at my full cart I      again if I even had enough to pay for it all. Then, as I put my own list back into my pocket, I saw the food     list under it. I smiled and decided to trust my heart.
With the food bank in mind, I went over and      two of the biggest boxes of rice the store had and put them in my cart. It took      six dollars out of my wallet to pay for them,       my heart felt six times larger when I did. And when everything was     , I had just enough to pay for it all.
It       so little to make our world a better place. A few dollars can help to fill a child’s       belly(肚子). A smile and hug can help to        a hurting heart. An encouraging word can inspire someone else to live and to love. A random        of kindness can change another’s day and life. It is up to us,       . If we can       a few dollars on rice , then we can share a love that will last forever.

C．appreciation

多项选择题

以下符合螨皮炎诊断的描述是()

A．多见于谷类收割者

B．好发于皮肤柔嫩处

C．可通过接触传染

D．水肿性丘疹或丘疱疹