您所在的当前位置：初中物理试题 >

物质的物理特征

> 丰富多彩的材料具有各种各样的性质，下列关于材料的性质及其应用的说法中正确的是 A.用钢铁做建筑材料，主要应用其导电性 B.用橡胶做汽车轮胎，主要应用其硬度大 C.机械表中的发条，主要应用其弹性 D.铁钉在石蜡上划过，留下了刻痕，说明不同物质的密度是不同的

问题：

发布时间：2024-09-07

丰富多彩的材料具有各种各样的性质，下列关于材料的性质及其应用的说法中正确的是

A.用钢铁做建筑材料，主要应用其导电性
B.用橡胶做汽车轮胎，主要应用其硬度大
C.机械表中的发条，主要应用其弹性
D.铁钉在石蜡上划过，留下了刻痕，说明不同物质的密度是不同的

参考答案：

提问用户：iL***6K2

可能感兴趣的题目：

1 (10分)如图所示，在成都天府大道某处安装了一台500万像素的固定雷达测速仪，可以准确抓拍超速车辆以及测量运动车辆的加速度。一辆汽车正从A点迎面驶向测速仪B，若测速仪与汽车相距355m，此时测速仪发出超声波，同时车由于紧急情况而急刹车，汽车运动到C处与超声波相遇，当测速仪接受到发射回来的超声波信号时，汽车恰好停止于D点，且此时汽车与测速仪相距335m，忽略测速仪安装高度的影响，可简化为如图所示分析（已知超声波速度为340m/s，）。（1）求汽车刹车过程中的加速度a；（2）此路段有80km/h的限速标志，分析该汽车刹车前的行驶速度是否超速?
2 Can you tell me________it was________your cellphone was lost? A．where；that B．which；that C．that；where D．where；which
3 已知函数f（x）=cos 2x+ 3 sinx•cosx+1 （Ⅰ）求y=f（x）的最小正周期和单调递增区间；（Ⅱ）求y=f（x）在区间 [0， π 2 ]上的最大值和最小值．
4 以下运动中在任意相等的时间内动量增量相同的是（） A．自由落体运动 B．竖直上抛运动 C．匀速圆周运动 D．平抛运动
5 在碱性溶液中能大量共存且溶液为无色透明的离子组是（　　） A．K+、MnO4-、Na+、Cl- B．K+、Na+、NO3-、CO32- C．Na+、OH-、NO3-、SO42- D．Fe3+、Na+、Cl-、SO42-
6 阅读理解。 After graduation I returned home to my small town in Indiana. I didn"t have a job yet. Mr. Hobbs, a friend of my father"s, owned a small shirt factory in town. Within the past five years it had grown from twenty to eighty workers. Mr. Hobbs was worried that his plant was getting too big and inefficient, so he asked me to come in on a short-term basis as a consultant. I went to the plant and spent about a week looking around and making notes. I was really a mazed at what I saw. Most curious of all, there was no quality control at all. No one inspected the final product of the factory. As a result some of the shirts that were put in boxes for shipment were missing one or two buttons, the collar, and even a sleeve sometimes! The working conditions were poor. The tables where the workers sat were very high and uncomfortable. Except for a half hour at lunchtime, there were no breaks in the day to relieve the boring work. There was no music. The walls of the workrooms were a dull gray color. I was amazed that the workers hadn"t gone on strike. Furthermore, the work flow was irregular. There was one especially absent-minded young man in the assembly (组装) line who sewed on buttons. After a while I recognized him as "Big Jim", who used to sit behind me in math class in high school. He was very slow and all the shifts were held up at his position. Workers beyond him in line on his shift had to wait with nothing to do; therefore, a great deal of time and efficiency were lost as Big Jim daydreamed while he worked. All week I wondered why he wasn"t fired. After I made observations for a week, Mr. Hobbs asked me for an oral report of my findings. 1. The shirts from Mr. Hobbs" factory can be described as ____. A. of low quality B. of high quality C. fashionable D. unfashionable 2. Why did Mr. Hobbs ask the writer to the factory? A. The factory was too big. B. The factory was not producing fast enough. C. The factory was not big enough. D. The writer was a college graduate. 3. Which is not likely to happen in the factory? A. The workers will have more rest in the day. B. Someone will examine the final product. C. New machines will be bought. D. The factory will be repainted. 4. Big Jim may get fired mainly because ____. A. he was slow B. he wasted much time C. he was absent-minded D. the work flow was irregular
7 将等物质的量的SO 2和Cl 2混合后的气体溶解于适量的蒸馏水，取该混合液滴入到含有品红和Ba(NO 3) 2的溶液中，则发生的实验现象是 A．红色溶液很快褪色 B．红色溶液不褪色 C．溶液中有沉淀生成 D．溶液中有气泡产生
8 一般来说，一个复杂的流程图都可以分解成 ______，______，______三种结构；
9 ________ is it since you began to learn English? A.How far B.How long C.How often D.How well
10 影响乳畜业生产的两个重要因素是 A市场与饲料供应 B市场与机械化水平 C交通和气候条件 D劳动力和饲料供应