您所在的当前位置：初中物理试题 >

探究浮力大小的实验

> 当盛油的厚壁钢瓶内压强很大，相当于大气压的1万到2万倍时，虽然瓶壁无裂痕，瓶内的油依然能从里面渗出，这是因为 A.金属原子间有空隙 B.油分子被压小了 C.油分子不停地做无规则运动 D.金属原子不停地做无规则运动

问题：

发布时间：2020-03-13

当盛油的厚壁钢瓶内压强很大，相当于大气压的1万到2万倍时，虽然瓶壁无裂痕，瓶内的油依然能从里面渗出，这是因为

A.金属原子间有空隙
B.油分子被压小了
C.油分子不停地做无规则运动
D.金属原子不停地做无规则运动

参考答案：

提问用户：4j***ldI

可能感兴趣的题目：

1 汽车原来以速度v匀速行驶,刹车后加速度大小为a,做匀减速直线运动,则t秒后其位移为（） A．vt-at2/2 B．v2/2a C．-vt+at2/2 D．无法确定
2 阅读理解。 The week I turned 50, my marriage came to a sudden end. My house, furniture and everything I"d owned was sold to pay debts that I didn"t even know I had. In a week I had lost my husband, my home and my parents who had refused to accept a divorce (离婚) in the family. I"d lost everything except my four teenage children. I used every penny I had to buy five plane tickets from Missouri to Hawaii. Everyone said I was crazy to think I could just run off to an island and survive. I was afraid they were right. Knowing that no one in the world was going to help us, I rented a cheap apartment. I worked 18 hours a day and lost 30 pounds because I lived on one meal a day. One night as I walked alone on the beach, I saw the red orange glow of the lava (火山岩) pouring out of Kilauea Volcano in the distance. It was time to live my imagination! The next day, I quit my job and invested my last paycheck in art supplies and began doing what I loved. I hadn"t painted a picture in 15 years. I wondered if I could still paint. My hands trembled the first time I picked up a brush. But before an hour had passed, I was lost in the colors spreading across the canvas (画布) in front of me. And as soon as I started believing in myself, other people started believing in me, too. The first painting sold for $ 1500 before I even had time to frame it. The past six years have been filled with adventures. My children and I have gone swimming with dolphins, watched whales and hiked around the crater (火山口) edge of the volcano. We wake up every morning with the ocean in front of us and the volcano behind us. The dream I had more than 40 years ago is now reality. I"m living freely and happily ever after. 1. It can be inferred from the passage that ____. A. the writer didn"t expect her marriage had ended in divorce B. the writer"s parents encouraged her to divorce C. the writer"s husband took away most of her property D. there was something wrong with the writer"s nerves 2. According to the passage, which of the following statements is NOT true? A. The writer was sure she could survive in Hawaii. B. The writer with her children met with many difficulties when they first arrived in Hawaii. C. The writer had ever done paintings before. D. The writer doubted if she could paint well at first. 3. The writer"s dream was to ____. A. live in nature with animals B. live near volcanoes and oceans C. become a successful painter D. live a free life 4. The best title for this passage is "____". A. My broken marriage B. My life after divorce C. Adventures over 6 years D. Hard life in Hawaii
3 某程序的框图如图所示，则执行该程序，输出的S=______．
4 读“亚洲水稻的主要分布地区”图，完成下列问题：(7分) （1）世界水稻生产主要分布在、和降水丰富的地区；（2）我国水稻生产主要分布在一线以南。（3）图示地区发展水稻种植业的区位优势有： ①气候： ②地形： ③劳动力：
5 阅读理解。 As my dad unwrapped the new bicycle helmet (头盔) that I got him for his birthday, I realized that a number of people ride their bicycles every day without the protection of a helmet. Due to cold winters across the country, riding has become increasingly dangerous as many roads have potholes and are torn-up (磨损的). Not everyone realizes that there are laws requiring the wearing of helmets in many places. Where I live, there has been a law in place since October l, 1992 stating that cyclists of all ages are required to wear helmets. Unfortunately, accidents can happen to the best of riders. My dad has been a cyclist for many years, and he often rides around my county and to Rockland Lake State Park. One afternoon, as he was just entering the park, he lost control of his bicycle and flew off and landed on a nearby patch of grass, breaking his helmet into pieces and losing consciousness. When he was just awakening, a lovely couple found him and brought him back to our house, where he attempted to recap the events leading up to his fall. Later that day, a CAT scan revealed that he had a concussion(脑震荡). That evening, while my dad was showing me the pieces of his broken helmet, we both came to a shocking realization. If he had not worn his helmet, he probably would have cracked his skull and perhaps died. Today, when my dad and I go out cycling, the wearing of our helmets is not even a question. Regardless of age, everyone should wear a helmet whenever they get on a bicycle. 1. According to the passage, which of the following statements is TURE? A. Young men needn"t wear helmets. B. The writer"s father didn"t wear a helmet until the writer bought him one. C. People don"t have to wear helmets on smooth surface roads. D. Accidents do not happen to the best cyclists. 2. In the writer"s opinion, why should people wear bicycle helmets? A. Because a law requires them to do so. B. Because many people like wearing bicycle helmets. C. Because people have realized the importance of wearing helmets. D. Because the conditions of roads are very poor and it is dangerous to ride on them. 3. The underlined part "we both came to a shocking realization" in Paragraph means "____". A. we understood how lucky the dad was to have worn a helmet B. we were shocked to see the broken helmet C. we realized that young people needn"t wear helmets D. only old people should wear helmets 4. From the accident that happened to the writer"s dad, we can infer that ____. A. the cyclists should follow the law B. his dad was not worried about this accident C. it is necessary for cyclists to wear helmets D. everyone should care about life
6 如图是一个算法的流程图，则最后输出的W的值为______．
7 在匀加速直线运动中，错误的是（） A．速度的增量总是跟时间成正比 B．位移总是随时间增加而增加 C．位移总是跟时间的平方成正比 D．加速度，速度，位移的方向一致
8 I can’t remember ________ made the teacher give Mary the permission to leave the class earlier. A．that it was what B．what it was that C．what was it that D．that was it what
9 已知函数 f(x)= 3 2 sin2x- 1 2 (cos2x-sin2x)-1 （1）求函数f（x）的最小值和最小正周期；（2）设△ABC的内角A、B、C、的对边分别为a、b、c，且c= 3 ，f（C）=0，若向量 m =(1， sinA)与向量 n =(2，sinB)共线，求a，b．
10 读图6，完成小题。小题1:关于甲、乙两国发展农业生产相同的有利条件叙述正确的是 A．地势平坦，土壤肥沃 B．季风气候，雨热同期 C．历史悠久，经验丰富 D．科技发达，政府支持小题2:近年来，对C所在区域非法牧场扩张所产生的不利影响有 ①生物多样性的减少 ②全球温室气候浓度上升，气候变暖加剧 ③地下水位上升 ④水土流失，河流泥沙含量增加 ⑤土地盐碱化、荒漠化加剧 A．①②③ B．②④⑤ C．①②④ D．①③⑤